How Taxing is Corruption on
This paper studies the effect of corruption on foreign direct investment. The sample covers bilateral investment from fourteen source countries to forty-five host countries during 1990-91. There are three central findings.(1) A rise in either the tax rate on multinational firms or the corruption level in a host country reduces inward foreign direct investment (FDI). An increase in the corruption level from that of Singapore to that of Mexico is equivalent to raising the tax rate by over twenty percentage points.(2) There is no support for the hypothesis that corruption has a smaller effect on FDI into East Asian host countries.(3) American investors are averse to corruption in host countries, but not necessarily more so than average OECD investors, in spite of the U.S. Foreign Corrupt Practices Act of 1977. On the other hand, there is some weak support for the hypothesis that Japanese investors may be somewhat less sensitive to corruption. Neither American nor Japanese investors treat corruption in East Asia any differently from that in other parts of the world.
There are other interesting and sensible findings. For example, consistent with theories that emphasize the importance of networks in trade and investment, sharing a common linguistic tie between the source and host countries and geographic proximity between the two are associated with a sizable increase in the bilateral FDI flow.
JEL codes: F02 and F23
* Send correspondence to:
** Acknowledgement: I would like to thank Kimberly Ann Elliott, John Gallup, Daniel Kaufman, Mary Hallward-Driemeier, James Hines, Robert Lawrence, Susan Rose Ackerman, Ray Vemon and Seminar participants at Harvard University and University of Southern California for helpful discussion, Greg Dorchak, Junling Wang, and especially Huamao Bai for efficient research assistance, and Mihir Desai, Paolo Mauro and Xiaolun Sun for supplying some of the data. I also wish to acknowledge gratefully the financial support from The Japan-United States Friendship Commission, a U.S. govemment agency. The views presented in the paper are mine, and not necessarily shared by any other individual or organization.
"We need to deal with the cancer of corruption... We can give advice,
encouragement and support to governments that wish to fight corruption - and it
is these governments that, over time, will attract the larger volume of
James D. Wolfensohn
This paper studies three sets of questions regarding the effect of corruption on international direct investment. First, does corruption in host countries affect negatively their ability to attract foreign direct investment (FDI)? How big is the effect relative to the host govemments tax on foreign corporations? Second, is East Asia a special group of host countries? I will test the hypothesis that corruption has no or reduced effect on inward FDI in the region, possibly because corruption has been part of the culture or a way of life for a long time. Third, is the United States a special source country? I will test the hypothesis that the American investors are especially sensitive to host country corruption, possibly due to the deterrent effect of the U.S. Foreign Corrupt Practices Act. I will explain the three questions in turn.
This first question is partly motivated by the observation on China. China has rampant corruption according to various newspaper accounts as weIl as surveys of business executives . Yet, for every year in the last four, China has been the largest developing host of international investment. Even its FDI flow-to-GDP ratio has been among the highest among developing countries.
Empirical evidence on a negative correlation between corruption and inward FDI has so far been elusive. In a study of U.S. firms foreign investment, Wheeler and Mody (1992) failed to find a significant correlation between size of FDI and host countrys risk factor, a composite measure that includes perception of corruption as one of the components. The authors concluded (p70) that the importance of the risk factor should "be discounted, although it would not be impossible to assign it some small weight as a decision factor."
Similarly, more recently, using total inward FDI (as opposed to bilateral FDI used in this paper), Hines (1995) failed to find a negative correlation between total inward FDI and corruption level in host countries. Commenting on his Table A6, Hines remarked (footnote 24 on page 20), "while the equations fit poorly, it is noteworthy that local corruption has an insignificant effect on post-1977 growth of FDI..." 
On the other hand, popular press and policy circles seem to believe that corruption does reduce inward FDI, as suggested by the opening quote from James Wolfensohn, President of the World Bank. So why is the empirical evidence so elusive? Wheeler and Mody (1992) mixed the corruption measure together with 12 other indicators to form one regressor (what the authors called "RISK"). These other indicators include "attitude of opposition groups towards FDI," "government support for private business activity" and "overall living environment for expatriates," which may not be overwhelmingly correlated with government corruption, may not be precisely measured, or may not be as important for FDI as one imagines. As a result, the noise-to-signal ratio for the composite measure (RISK) may be too high to show up significantly in the regressions. In the part of the Hines paper (1995) that deals with this question, the total inward FDI from the IMFs IFS database may also be too noisy.
The first objective of this paper is to reexamine the corruption effect on a broader panel of bilateral FDI data with a more comprehensive list of control variables. To reveal the "bottom line" I will report evidence that corruption in a host country does depress inward FDI in a way that is statistically significant and quantitatively large.
The second motivation of the paper concerns East Asia as a host region. By popular account, many East Asian countries have a high level of corruption. Aside from the China example that was mentioned above, Indonesia is another apparent paradox. President Suharto is known as "Mr. Ten Percent," as foreign corporations doing business there are naturally expected to pay a relatively well-defined bribe to the President or members of his family. Yet, Indonesia is a popular destination of FDI, particularly those from Japan. To see the rapid influx of the FDI into the region, consider the observation by the United Nations World Investment Directorv 1992, Vol.1(p14)
"Since 1986, the Asia-Pacific region has become the largest recipient of FDI among developing countries, accounting for abaut half of all flows to the third world. In the late 1980s, FDI flows to Asia and the Pacific grew rapidly. Average annual investment flows into most Asian and Paciflc countries increased faster between 1980-82 and 1986-88 than between 1975-77 and 1980-82. In the case of the newly industrializing economies and ASEAN member countriees, those flows increased by a factor of 3 (a factor of 7 for the Republic of Korea) between 1980-82 and 1986-88 (with the exception of Singapore) and by a factor of 13 for China during the same periods."
One possible hypothesis is that corruption has been part of the culture in these economies for a long time. Countervailing institutions may have been developed to circumvent corruption so that its negative effect on FDI is minimized. An alternative hypothesis is that East Asia is not special. The large volume of FDI into East Asia is a response to the regions higher than average growth rate. Within the East Asia region, foreign investment still prefers to go to less corrupt countries. In other words, had the corrupt countries in the region been less so, they would have attracted even more FDI. The second objective of the paper is to discriminate between the competing hypotheses. As far es I know, this paper presents the first piece of systematic evidence on this issue one way or the other.
The third motivation of the paper comes from the U.S. govemments concern that the Foreign Corrupt Practices Act (FCPA) of 1977 may have undermined the American firms competitiveness in the overseas markets vis a vis firms from Europe, Japan and elsewhere. The FCPA came as a by-product of the Watergate hearings in the early 1970s, where many American firms were discovered paying large bribes to foreign officials in addition to contributing to domestic political parties. As a sign of the mood of the day, the bill was passed unanimously in both the Senate and the House, and was signed into law by President Carter. At the time the law was enacted, it may have been hoped that other major source countries would follow suit. But that has not happened so far. The FCPA has made the United States the only source country in the world that penalizes its multinationais or their officers with fines or jail terms for bribing foreign government ofticials.
On a priori ground, the American multinationals may not necessarily dislike the law. Aside from the moral position of the comorate officers, the law may serve as a useful commitment device for them in the face of foreign corrupt officials demand for bribery. The law allows them to say something to the effect, "I would like to pay you. But I am sorry I cant. If I do, I will go to jail." This commitment device is not available to companies from other source countries. If the American firms have the one and the only kind of technology that the host country needs, the American firms may very weIl still capture the business but with a lower cost (because of no bribery). In this case, the FCPA would not hinder the U.S. investment. Alternatively, if the American firms can find a way to circumvent the law (e.g., by using a dose substitute for outright bribery payment), their competitive position vis a vis other investors would not be affected either. Hence, the effect of the FCPA on the American competitiveness becomes an empirical one: Is it binding at the margin?
Using country dummies as a measure of corruption, Beck, Maher and Tschoegl (1991) found a statistically significant but quantitatively small effect of corruption on the U.S. export competitiveness. In the concluding chapter of J. David Richardsons book (1993), Sizing Up U.S. Export Disincentives, the author noted under the section titled "surprisingly small estimates" (p131) that, "across-the-board regulatory burdens, such as procedures mandated for all businesses by the Foreign Corrupt Practices Act, seemed generally unimportant." The best and the most recent evidence on U.S. FDI and exports was provided by James Hines, Jr. (1995). Controlling for the growth of the host country GDP, Hines found evidence that corruption negatively affects the growth of U.S.-controlled FDI during 1977-1982, their capital/labor ratio, incidence of joint ventures, and aircraft exports. He interpreted the findings as evidence that FCPA has undermined the American firms competitiveness relative to other countries.
There are some reasons to think that the Hines interpretation may require some additional evidence. First, corruption may reduce FDI from non-U.S. investors to the extent that they feel morally obligated to avoid bribery. Second, American firms may be just as clever at finding covert substitutes for bribery payments as other investors.  Third, the degree of corruption in host countries tends to be highly correlated with many other dimensions of the govemment quality, such as extent of bureaucracy and red tape, or quality of legal system. These features are Iikely to affect non-U.S. investors as well. To attribute the U.S. FDIs negative correlation with corruption measure to the FCPA, we need to control for the response of all FDI to corruption. 
I will also investigate whether Japan is a special source country in the sense that its investors may be less sensitive to corruption in host countries. Popular press accounts and anecdotes give one an impression that Japanese corporations have a higher propensity to bribe officials at home and that this propensity may carry over to cross-border business dealings. If this is true it may give Japanese multinationals a competitive edge in corruption-prone host countries. According to the logic of Encarnation (1992), whatever helps the Japanese multinationals relative to the American ones also helps its global competitive position vis a vis the U.S.
The classical theoretical work on corruption includes Nye (1970), Rose Ackerman (1975 and 1978) and Shleifer and Vishny (1993). In light of the literature, let me be up front about the limitations of this paper. Susan Rose- Ackerman (1978) made a distinction between bribery (induding campaign contribution) to erect or change the rules/laws to favor the payers, and bribery to deviate from an honest implementation of the exiting rules/laws. Shleifer and Vishny (1993) made a distinction between organized or efficient corruption (the payers can get things done after a relatively well-defined bribe), and disorganized or inefficient corruption (there is still a big residual uncertainty even after the bribe). The measures of corruption  used in this paper cannot capture this conceptual richness. I would suppose that the survey- based corruption measure refers mainly to the administration of rules/laws pertinent to foreign firms, and probably is weighted by efficiency level as perceived by those who were surveyed.
Corruption can have many other detrimental effects on the host countries. In
economic sphere, corruption may reduce growth rate, possibly as a result of
reduced domestic investment (Paulo Mauro, 1995; Knack and Keefer, 1995; Rodrik,
1996; and Kaufmann, 1996
In political economy terms, corruption often contributes to an unfair income or
wealth distribution. In political terms, corruption can breed political
instability. These important aspects of corruption may interact with its effect
on inward FDI. This paper does not explicitly study any of these effects.
The paper is organized as follows. Section 2 describes the data set. Section 3 reports the statistical results. And Section 4 provides concluding remarks.
The key explanatory variable is the two-year bilateral flows of foreign direct investment (FDI) over 1990-91. I calculate the FDI flows as the difference between the end-of-year stock data in 1989 and 1991. The FDI stock data comes from the OECD data base covering fourteen source countries including the seven the largest ones in the world: the United States, Japan, Germany, the United Kingdom, France, Canada and ltaly. It covers forty-five host countries.  Many OECD member countries report both outward FDI and inward FDI. I choose the outward FDI as it is more likely to be consistent in definition for a given source country. I use two-year flows rather than one-year data in order to reduce the impact of year-to-year idiosyncratic shocks.
The data on 1989 host countries tax rate on foreign corporations is the minimum of the following two measures: the statutory marginal tax on foreign corporations as reported by Price Waterhouse (1990), and tax payment to the host governments by the foreign subsidiaries of American firms divided by their total income in that country. The data on twenty eight of the host countries are taken from Hines and Desai (1996, Appendix Table 2). The rest (seventeen countries) are either obtained using the Price Waterhouse source with the kind assistance of Mihir Desal or calculated by me (for China).
I use two measures of corruption, both of which are based on surveys of respondents. The first one was based on surveys conducted and organized during 1980-83 by Business International (BI), now a subsidiary of the Economist Intelligence Unit. BI reports a number of survey-based rankings of country risk factors, of which "corruption" is one. The BI corruption measure is an integer from one (most corrupt) to ten (least corrupt) according to "the degree to which business transactions involve corruption or questionable payments." The data is kindly provided by Paolo Mauro, who collected them by hand from BIs archives. The second measure is compiled by Transparency International (TI), an agency dedicated to fighting corruption worldwide. The TI index is scaled from zero (most corrupt) to nine (least corrupt). The TI index itself is an average of ten survey results on corruption over a number of years. The averaging procedure used by the TI could reduce measurement error if the errors in different surveys are independent. On the other hand, the ratings on different countries are derived from different surveys, potentially introducing inconsistency in the cross-country ratings. Fortunately, the BI and TI indices are highly correlated (with a correlation coefficient equal to 0.89). In the subsequent sections, I will report estimation results using both measures, while concentrating the discussion on results using the BI index.
To avoid awkwardness in interpreting the coefficient, I redefine "corruption" measure in this paper to be ten minus the two respective indices, so that zero for BI and one for TI indices indicate "no corruption," and nine for BI and ten for TI "the highest level of corruption."
The GDP and population data are from the International Monetary Funds International Financial Statistics data base. In a few cases where GDP data are not available, GNP data are used instead. The wage and labor compensation data are from International Labor Organization, with the kind assistance of Xiaolun Sun.
Four other survey-based qualitative measures of barriers to investment come from The 1996 World Competitive Report. They are restrictions on cross- border ventures, on foreign investors ability to exert corporate controls, on their eligibility to bid for public sector contracts, and on their ability to access host countrys domestic capital markets.
The dummy on linguistic tie takes the value of one if the source and host countries share a common language, and zero otherwise. The data on distance measures the "greater circle distance" between the economic centers in the source host pair. Both data have been used in Frankel, Stein and Wei (1995) and Wei (1996).
The data on 1990 adult literacy ratio is defined as one minus 1990 adult illiteracy ratio. Adult illiteracy ratio comes from Table 1 of the World Banks World Development Report 1995, which cites the U.N. Educational, Scientific, and Cultural Organization (UNESCO) as the original source. The Report does not present illiteracy rate for high-income countries, but contains a footnote that reads "according to UNESCO, illiteracy is less than 5 percent." I assign 2.5 percent as the illiteracy rate for these high-income countries. According to the World Bank Reports technical notes (p231), "adult illiteracy is defined here as the proportion of the population over the age of fifteen who cannot, with understanding, read and write a short, simple statement on their everyday life."
The Information on 1990 total secondary school enrollment comes from Table 28 of the same World Bank Report. The technical notes to the Table (p241), the data are estimates of the ratio of chudren of all ages enrolled in secondary school to the countrys population of secondary-school-age children. It notes that the definition of secondary school age "differs among countries," and "is most commonly considered to be 12 to 17 years." It further notes that "late entry of more mature students as well as repetition and the phenomenon of ,bunching in final grades can influence these ratios."
Table 1 reports summary statistics on some of the key variables in this paper for the all host countries and for East Asia countries. We observe that East Asian countries on average are more corrupt than other countries in terms of either measure of corruption, and somewhat less stable politically, both of which in principle may discourage foreign investment. On the other hand, East Asian countries on average have lower tax rate and lower wage rate, both of which in principle may encourage foreign investment.
3. Statistical Estimation
Preliminary Double-log Linear Model
I will start with a preliminary linear model (after taking logarithm for both the dependent variable, FDI, and most of the independent variables, such as GDP and distance). The model will be estimated using the Ordinary Least Squares (OLS) method. The dependent variable is the cumulative flows of FDI in logarithm during 1990-91 from source country i to host country j. Use "taxi" and "corruptionj" to denote host country js tax rate on foreign corporations and its corruption level, respectively. Then, the basic regression specification is
log(FDIij) = Xij ß - Ý1taxj - Ý2 corruptionj - eij
where X is a vector of control variables other than tax and corruption that are relevant for determining the bilateral FDI. b, g1 and g2 are parameters.
I will implement a quasi-fixed effects model. That is, the X-vector in all regressions will include source country dummies.  The source country dummies are meant to capture all characteristics of the source countries that may be relevant to its size of outward FDI, including its GDP and level of development. In addition, differences in the definition of FDI across source countries can be controlled for by the dummies under the (somewhat audacious) assumption that these definitions are proportional to each other except for an additive error term uncorrelated with other regressors in the regression. I do not include host country dummies as doing so would eliminate the possibility of estimating all the interesting coefficients including the effects of tax and corruption.
Does Corruption Discourage FDI? The OLS Estimates
Table 2 presents the results of the basic regressions using the Business International (BI) index as a measure of corruption. In Column 1, I control for the size of the host country by its GDP and population, both in logarithm, the distance between the source and host countries, and a dummy for whether they share a common language. The coefficient on the marginal tax rate (on foreign investors) is negative and statistically significant at the five percent level. A one percentage point increase in the marginal tax rate reduces inward FDI by about five percent. The coefficient on the Corruption measure is also negative and significant. The numerical effect is remarkably large. A one-grade increase in the corruption level is associated with a sixteen percent reduction in the flow of FDI , or approximately equivalent to a three percentage point increase in the marginal tax rate. In other words, a worsening in host governments corruption level from that of Singapore (with a BI-rating of Zero) to that of Mexico (with a BI-rating of 6.75) is equivalent to about 21 percentage point  increase in the marginal tax rate on foreigners.
There are other interesting observations from the first regression. The coefficient on the distance variable is negative and statistically significant at the five percent level: a one percent increase in distance is associated with a 1.14 percent reduction in the FDI flow. Thus, international investment to some extent is a neighborhood event. On the other hand, the coefficient on the linguistic dummy is positive and significant at the fifteen percent level: sharing a common language or colonial history is associated with a sizable increase in bilateral FDI flow. Some authors (e.g., Rauch, 1996a and 1996b) have emphasized the importance of networks in business transactions. While it is difficulty to measure the strength of network precisely, distance and linguistic tie may capture part of it, and the evidence presented here is consistent with the network notion.
Because the log(population) term is not statistically different from zero, I drop this variable in other regressions reported in Table 2. One may worry about possible endogeneity of the GDP variable. Since population and GDP are highly correlated, use log(population) as an instrumental variable for log(GDP). Column 2 reports such an IV regression. Both tax and corruption continue to show a negative effect on FDI. The point estimate of corruption gets substantially larger.
Many countries eftectively exempt foreign source income from domestic taxation. So direct investment from these countries should be sensitive to foreign tax rates. The tax codes of the United States, United Kingdom and Japan allow their multinational firms to claim credit for taxes paid to foreign governments (up to the limit of what they would have to pay to the home governments if the foreign source income were derived domestically). This could makes direct investment from these source countries insensitive to foreign tax rate (up to a limit). On the other hand, foreign tax credit can be claimed only when profits are repatriated. Many multinational firms from U.S., UK and Japan choose to reinvest a substantial fraction of their foreign income in the plants in the host country (Hines and Hubbard, 1990). In this case, their firms may still be sensitive to host country tax rates. For this reason, to what extent FDI from these three source countries is sensitive to host countries tax rate becomes an empirical question. To investigate this, I add to the regression an interactive term, "ftci * tax-ratej," where ftc is a dummy variable taking the value of one if the source country is either the U.S., UK or Japan. The result is in Column 3 of Table 2. The coefficient is -0.01 and not different from zero at the ten percent level. Hence, it appears that the FDIs from these three source countries are just as sensitive to the tax rate in host countries as FDIs from other source countries. More importantly, the estimated effects of tax and corruption on FDI are unaffected by the indusion of this variable.
Column 4 adds the host countrys wage level (in logarithm) to the list of regressors. This is motivated by the popular hypothesis that many FDIs chase low-cost labor in the host countries. This suggests a negative correlation between the size of inward FDI and hosts wage level. Contrary to the expectation, the estimated coefficient for the wage variable is positive (0.50) and significant at the ten percent level. Though it is not consistent with the Popular labor cost hypothesis, this finding echoes many other papers in the literature.  It is important to note that, for our purpose, the coefficients for the tax rate and corruption measures remain negative and statistically significant.
There is a reason to suspect that the specification in Column 4 may not be a fair test of the low labor cost hypothesis. We know that some of the FDIs move from developed countries to developing countries (primarily as part of vertically integrated firms), but many move from developed to developed countries (primarily in the form of horizontally integrated firms). Implicitly if not explicitly, the labor cost hypothesis is postulated only for the first type of FDIs. To account for this, I let the labor cost to play potentially different roles for the two types of the FDIs. Specifically, I create an OECD dummy for all host countries which are members of OECD up to 1990. I add an interactive term, "OECD * log(wage)," and the dummy itself, "OECD," to the list of regressors. The result is reported in Column 5. The coefficient for log(wage) term now is negative and statistically significant, consistent with the FDIs-chasing-low labor-cost story. For a non- OECD host country, a one percent increase in the wage rate 5 associated with a 0.8 per cent reduction in inward FDIs.
The positive coefficient on the OECD dummy indicates that all OECD host countries tend to receive more FDIs than the sample average. A F-test indicates that the sum of the two coefficients for log(wage) and the interactive term (- 0.78+1.28=0.5) is not different from zero. Hence, within the OECD host countries, there is no relationship between the size of inward FDIs and the host countrys wage level. In sum, this demonstrates the need to separate the two types of FDIs when one investigates the effect of host country labor cost. To my knowledge, this empirical finding is new in the literature.
With the host Countrys labor cost taken into account in Column 5, the coefficients for tax rate and corruption measures have changed only slightly. So our basic qualitative results survive this extension.
Besides the labor cost story, one may conjecture that a host countrys education level, or its endowment of skilled labor may play an important role in attracting inward FDI. This is a key feature of the new FDI theory of Markusen (1994) and Zhang (1996). As an extension, I ran three additional regressions (not reported to save space) adding three different measures of human capital in host countries, one at a time. They are literacy ratio, enrollment of secondary schools, and per capita GDP, respectively. Somewhat disappointingly, none of them is statistically significant. Again, the coefficients on tax rate and corruption remain largely unchanged. I have used labor compensation instead of wage rate in the regressions (not reported) with same qualitative answers. But the number of observations is substantially smaller for compensation than for wage data.
Modified Tobit Estimation
There is a potential problem with the double-log linear specification in the previous subsection. Not all countries receive direct investment from all source countries. These zero FDI observations are dropped from the sample when a double-log specification is implemented. If it is the case that the desired level of FDI based on the characteristics of the host country and host-source relation is zero or negative, we have the classic censored sample problem. Dropping these observations could lead to inconsistency. Unfortunately, it is not feasible to apply the Tobit specification while maintaining the double log structure on the two sides of the equation, as the logarithm of zero (FDI) is undefined.
ln(FDIij + A) = Xß + uij if Xß + uij > ln(A)
= ln(A) if Xß + uij <= ln(A)
In this section, I define a modified Tobit specification.
Where A is a threshold parameter to be estimated. u is an i.i.d random variable with mean zero and variance s2. In this specification, when Xb+u exceeds a threshold value, lnA, there will be a positive flow of foreign investment; and when Xb+u is below the threshold value, the realized level of foreign investment is zero (and desired level could be negative). Eaton and Tamura (1996) pioneered a version of this specification.
I will implement the estimation with the maximum likelihood method (See an Appendix for a derivation of the MLE estimator).
The basic regression results are reported in Table 3. In Column 1, I have as control variables the host countrys GDP, the distance between the host and source countries, and a possible linguistic/colonial connection between the two. The key variables are host countries tax rate and corruption. Both variables produce negative coefficients that are statistically significant. Hence, when zero observations are taken into account, we still find that tax and corruption deter foreign direct investment.
In column 2, we add the log of population in the host country to the list of control variables. It has a coefficient (0.00013) and statistically significant. The point estimate for the tax effect gets somewhat smaller (to - 0.00331 from -0.00440). And that for the corruption effect gets slightly larger (to -0.00012 from -0.00010).
Suppose b1 and b2 are coefficient estimates for tax rate and corruption, respectively. Given the specification, a 100/b1 percentage point change in tax rate and a 1/b2 change in the rating of corruption would produce the same amount of change in the FDI flow. Therefore, a one-step increase in the corruption measure is equivalent to 100b2/b1 percentage points increase in the tax rate. Using the estimates in Column 2, a one-step increase in the corruption level is equivalent to a rise in the tax rate by 3.6 percentage points, other things equal. An increase in corruption level from that of Singapore (whose rating is zero) to that of Mexico (whose rating is 6.75) is equivalent to raising the tax rate by 24 percentage points.
In Column 3, we add an interactive term between tax rate and a dummy indicating that the source countries offering foreign tax credit. The point estimate of the coefficient is positive (0.90), indicating that the FDI from the U.S., UK and Germany that grant foreign tax credits is somewhat less sensitive to host countries tax rate. However, as with the OLS results, the coefficient variable is statistically not different from zero at the ten percent level.
One may speculate that political stability promotes foreign investment, and that corruption and political stability are negatively correlated. The causality on the corruption/stability nexus can go both ways: official corruption may breed public discontent, which may eventually topple the government; altematively, instable political environment induces officials to have short horizons and to grab whatever rents available while they can. It may be useful to investigate the independent effect of corruption on FDI after controlling for political stability.
In the next regression reported in Column 4, I include a measure of political stability. The new variable produces a positive coefficient (0.085), which is consistent with the notion that stable political regime in a host country promotes inward foreign direct investment. On the other hand, the estimate is only marginally significant at the fifteen percent level. More importantly to our central discussion, the estimated effect of corruption on FDI is little affected by the inclusion of the measure of political stability. Using the estimates in Column 4, a one-step increase in corruption is equivalent to rasing tax rate by three percentage points. An increase in corruption from the Singapore level to Mexico level is similar to a rise in tax rate by 21 percentage points. 
Column 5 controls for source countries offering foreign tax credits. This again does not change any result.
The labor cost variables appear to have contributed to explaining cross- country variations in FDI in the earlier OLS estimations. In Table 4, we add labor cost variables to the modified Tobit estimations. We again do this in two ways. First, we add a measure of hourly wage cost in the host countries. Second, we allow for possibly different effects between labor cost in developing countries and that in OECD countries. The labor market variables turn out to be insignificant in the Tobit specification. The estimates on the effects of tax and corruption remain essentially intact.
The myth of East Asian Exceptionalism
I now turn to the hypothesis that corruption has no or reduced effect on FDI into the East Asian countries. To test this, I create an East Asia dummy, "EastAsia," for the eight developing host countries in the region that are part of the sample: The Philippines, Malaysia, Singapore, Thailand, Korea, Taiwan, China and Hong Kong. I add an interactive term, "EastAsia*Conuption," together with the dummy itself to the basic specification. The result is reported in Table 4.
There are several interesting findings. First, the positive coefficient on the EastAsia dummy indicates that the region has received more inward FDI than what can be predicted based on GDP, population, proximity, and linguistic tie to source countries. Second, controlling for the East Asia effect, the effects of tax and corruption on FDI are still negative. A one-step increase in the corruption measure is now equivalent to 5 percentage point increase in the tax rate.  Third, the coefficient on the interaction term between EastAsia dummy and the corruption measure is a small positive number, which could indicate that the effect of corruption in East Asia on FDI is slightly smaller than elsewhere. But the estimate is tiny in magnitude and not different from zero in a statistical sense (even at the fifteen percent level). Hence, there is no support for the hypothesis that corruption in East Asia has no or reduced effect on inward FDI. Within East Asia, foreign investors would still prefer to go to a less corrupt host country than a more corrupt one, just as they do elsewhere.
One may want to control for some possible outliers. In particular, Hong Kong and Singapore are two special economies in the region. Both have a reputation for having a clean government and predictable rule of law. On the other end of the spectrum, China is reported to have rampant corruption. It is possible that our earlier estimates are influenced by these observations. To investigate this, I also add to the regression three separate dummies for Hong Kong, Singapore and China as host countries. The results are reported in the Columns 3 and 4 of Table 5.
It is interesting to observe that the coefficients for the China dummy are negative (-0.81 and -0.89) and statistically significant. This means that China is actually an underachiever as a host of FDI from the major source countries in the sample.  This is reassuring for the purpose of this paper in that foreign investors from the major source countries did not show less sensitivity to Chinas rampant corruption. On the other hand, the low FDI into China during 1990-91 could be part of the after-effect of the Tiananmen Square Incident. In addition, the direct investment from overseas Chinese in Hong Kong, Taiwan and elsewhere, the largest source for Chinas inward FDI, could potentially behave differently from the investors included in this sample.
It is perhaps surprising that, once controlling for the fact that all East Asian countries receive lots of inward foreign investment, the coefficients for Singapore and Hong Kong dummies are also negative. Using the estimates in Column 4, the sum of the Singapore coefficient (-0.74) and the East Asia coefficient (0.77) is not significantly different from zero according to a F-test. The same is true for the Hong Kong effect. This means that Singapore and Hong Kong are very similar to other non East Asian countries as hosts of FDI.
The most important observation from Columns 3 and 4, from the viewpoint of
the main question of this section, is that the eftects of tax and corruption on
FDI remain unchanged after the inclusion of the dummies for China, Singapore and
Hong Kong. Foreign investors are still no less averse to corruption in East Asia
A measure of political stability in host government is added to the regressions in Columns 5 and 6 with no noticeable change in terms of the main results.
To check the sensitivity of the results to the choice of corruption measures, Table 6 replicates several key regressions in Table 5 using the TI index rather an the BI index. All the main qualitative results are unchanged. The estimated effect of corruption (and that of tax) on FDI is somewhat larger. Hence, we conclude that the inference is not sensitive to the choice of the corruption measure.
Are American Investors More Sensitive to Corruption?
The Foreign Corrupt Practices Act makes the U.S. the only source country that provides an explicit penalty to its firms for bribing foreign govemment officials. In this section, I will examine whether or not American investors are more sensitive to corruption than those from other source countries. To accomplish this, I will add to the regression an interactive term, "USi,*Corruptionj" where "USi"is a dummy variable taking the value of one if the source country is the United States and zero otherwise. There are three plausible hypotheses.
(Hypothesis 1) Corruption discourages U.S. investors in the same way as non-
U.S. investors. In this case, the interactive term will have a zero coefflcient.
(Hypothesis 2) Corruption only discourages U.S. investors. Hence, the interactive term will have a negative coefficient, and the generic corruption measure will no longer be negatively correlated with FDI.
(Hypothesis 3) Corruption discourages FDI from all investors, but it depresses that from the US. even mare. In this case, the coefficients on both the corruption measure and the interactive term will be negative and significant.
The coefficient estimate on the newly added interactive term is -0.12,
comparable in magnitude to the coefficient on the generic corruption measure.
Thus, the point estimate could be consistent with Hypothesis 3 above. In fact,
U.S. investors could be twice as sensitive to corruption as an average OECD
investor. On the other hand, due to the large standard error, the coefficient is
only statistically different from zero at the fifteen percent level, making it
difficult to reject Hypothesis 1 above at the ten percent level, that U.S.
investors are sensitive to corruption, but no more so than an average investor
from other OECD countries.
There are several plausible, not mutually exclusive explanations for the possibility that the American investors are equally but not more averse to host country corruption relative to other investors. First, corruption is often an indicator for general weak enforcement of contracts by host governments, Byzantine bureaucracy and so on, that hurts every investor, regardless of whether the source country government forbids bribery payment by its companies. Second, to the extent that investors feel repulsive about corruption, they may be deterred by it just as much as the Americans, even without a formal law like the U.S. FCPA. Finally, when bribery becomes a necessary pan of the business deal, the American firms are just as clever as other investors at finding covert means to pay it in spite of the FCPA.
Using the same method, I also investigate the sensitivity of Japanese investors to host country corruption: I will augment the regression in Column 1 by an additional term, "Japani*Corruptionj," where "Japanj" is a dummy variable taking the value of one if the source country is Japan and zero otherwise. The result 5 reported in Column 2 of Table 7. This coefficient is positive (0.07), consistent with the possibility that Japanese investors are somewhat less sensitive to corruption than other investors.
But the estimate is statistically not difterent from zero.
it may be interesting to examine whether the U.S. and Japanese investments in East Asia are any different from those elsewhere. To this end, I add four new variables to the specification in Column 2. Two of the variables are meant to capture any special factor that may influence their investments in East Asia (but not elsewhere): US*EastAsia, and Japan*EastAsia. Two others are meant to measure if their sensitivity to corruption in East Asia is any different from that in other parts of the world: US*Corruption*EasrAsia, and Japan*Corruption*EastAsia. The result is reported in Column 3. As it tums out, the four new variables do not produce coefficients that are difterent from zero at the ten percent level. Hence, these two major source countries investments in East Asia, or their sensitivity to corruption in the region1 are not unusual relative to the prediction of the overall model. On the other hand, once we have added these four variables, the coefficient on the interactive term, "Japani*Corruptionj" becomes larger (to 0.13) and statistically significant at the five percent level. Hence, there is now some support for the notion that Japanese investors are somewhat less sensitive to corruption.
In Column 4, a measure of political stability is added to the regression. Political stability is still found to promote inward foreign investment. Controlling for this, corruption still discourages foreign investment. U.S. investors do not behave differently from others in any statistically significant way. On the other hand, Japanese investors appear to be somewhat less sensitive to corruption. Investors from both U.S. and Japan appear to dislike corruption in East Asia exactly the same way as they do in other parts of the world.
Using the Transparency Internationals Index for corruption, Table 8 replicates some of the key regressions in Table 7 with broadly similarly results. Hence, the inferences derived from Table 7 do not depend on the particular choice of the corruption measure.
4. Concluding remarks
This paper studies the effect of taxation and corruption on international direct investment from fourteen source countries to forty-five host countries. There are three central findings. First, an increase in either the tax rate on multinational firms or corruption level in the host governments would reduce inward foreign direct investment. An increase in the corruption level from that of Singapore (a BI-rating of zero) to that of Mexico (a BI-rating of 6.75) is equivalent to raising the tax rate by 21-24 percentage points.
Second, there is no evidence that international investors are less sensitive to corruption in East Asia. It is appropriate to add some comments here on the FDI in China. Though the size of annual inflow is large, over 60% of It in each of the last ten years came from overseas Chinese, notably those in Hong Kong.  In other words, China is not a typical host country. FDI from the ten largest source countries in the world, all of them members of the OECD, accounts for a relatively small portion of total FDI going into China. In the estimation reported in this paper, China is in fact an underachiever as a host for FDI from the major source countries. This is consistent. with the inference of this paper that investors from the major source countries prefer to go to less corrupt countries. What is intriguing is that the overseas Chinese are apparently less sensitive to corruption, possibly because they are better able to use personal connection to substitute for the rule of law, a subject awaiting fruitful future research.
Third, American investors are averse to host country corruption but not necessarily more so than other investors, in spite of its unique Foreign Corrupt Practices Act. There is also some weak evidence that Japanese investors are less sensitive to corruption, possibly correlated with the way business transactions are conducted in Japan.
There are other interesting findings. For example, there is some support for the labor cost hypothesis of FDI for non-OECD host countries. In the OLS estimations, I find a negative correlation between the wage level and the size of inward FDI for non-OECD hosts but zero correlation for OECD hosts. However, this result does not carry over to the modified Tobit estimation. Also, consistent with the importance of networks, sharing a common linguistic tie between the source and host countries and geographic proximity between the two are found to be associated with a sizable increase in the bilateral FDI flow.
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