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Trade, FDI, migration, and the place premium: Mexico and the United States

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Abstract

Large wage differences between countries (“place premiums”) are well documented. Theory suggests that factor price convergence should follow increased migration, capital flows, and commercial integration. All three have increased between the United States and Mexico over the last 25 years. This paper evaluates the degree of wage convergence between these countries during the period 1988 and 2011. We match survey and census data from Mexico and the United States to estimate the change in wage differentials for observationally identical workers over time. We find very little evidence of convergence. What evidence we do find is most likely due to factors unrelated to US–Mexico integration. While migration, trade, and FDI may reduce the US–Mexico wage differential, these effects are small when compared to the overall wage gap.

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Notes

  1. World Bank Development Indicators. See http://data.worldbank.org/data-catalog/world-development-indicators.

  2. See Brown (1992) for a survey of early general equilibrium models of NAFTA.

  3. Several papers document within-country wage responses to price changes that are consistent with Heckscher-Ohlin predictions. See Beyer et al. (1999) for Chile, Robertson (2004) for Mexico, and Michaels (2008) for the United States.

  4. The lack of evidence of factor price equalization generally has prompted many to question the validity of neoclassical HOS-type models. Schott (2003) finds that we live in a “multi-cone” world that precludes factor price equalization. Davis and Mishra (2007) suggest that ignoring important variation between the mix of factors employed in the production of domestic and imported goods obfuscates the possible effect that free trade may depress the wages of workers in relatively labor-intensive domestic industries. Goldberg and Pavcnik (2007) discuss evidence of rising inequality in poorer countries in the wake of many trade liberalizations in the eighties and nineties, which is very much at odds with a standard HOS story of how globalization should unfold. The authors provide numerous reasons why the predictions of the standard HOS theory may not hold in the data such as technology, the pattern of tariff reductions, and within-industry shifts.

  5. It is possible to analyze migration using general-equilibrium trade models. In the HOS framework, immigration is generally analyzed through the Rybczynski and Factor Price Insensitivity theorems. Under the assumptions that the two countries are in the same diversification cone and are small enough for immigration to have no effect on output prices, these theorems predict that immigration has no effect on wages because immigrants are absorbed through changes in the production mix.

  6. In addition to the ENOE, we use its predecessors, the Encuesta Nacional de Empleo (ENE) and the Encuesta Nacional de Empleo Urbano (ENEU).

  7. Readers familiar with the ENOE data used in this paper will recall that the ENOE does, in fact, include rural workers. We merge the ENOE with the earlier incarnations of the labor force surveys (the Encuesta Nacional de Empleo Urbano) that only include urban areas. To generate a consistent series through time, we exclude the rural workers from our ENOE samples.

  8. We also converted Mexican wages to 1990 US dollars by first deflating the wages to 1990 pesos using the Mexican CPI and then converting them to US dollars using the 1990 exchange rate. Overall, this alternative method did not make too much of a difference. We conduct a comparison of these two deflation methods in the “Appendix 2”.

  9. Lustig et al. (2012) argue that the increase in the supply of education in Mexico played a significant role in reducing income inequality in Mexico.

  10. See http://wenr.wes.org/2013/05/wenr-may-2013-an-overview-of-education-in-mexico.

  11. One might be reasonably concerned that workers in the same cells are not comparable across countries. In fact, cell comparability has been contentious in the literature. Alternative matches, such as Mexican workers with 9–11 years of schooling being matched with US workers with 6–8 years of schooling, might be justified using occupation data. Since a thorough analysis of such matches might be worthy of its own study, we consider alternative matches to be beyond the scope of the current paper and instead follow the convention established in these papers.

  12. We also generate the same results using the mean of the person-level log monthly earnings and get basically identical results.

  13. Dussel Peters and Gallagher (2013) argue that China had a significantly negative influence on NAFTA trade.

  14. In unreported results, we also analyze the standard deviation of the earnings differentials across cells. The standard deviation of wage differentials across cells exhibit breaks at the times indicated by the Vogelsang and Perron test statistic. The standard deviation rises steadily until the end of the sample, again supporting the use of multiple structural breaks.

  15. Hours worked per year were obtained by taking usual hours worked per week times the number of weeks that the respondent reported to have worked during the year.

  16. See Zong and Batalova (2014) for an overview of Mexican migration to the United States.

  17. Interestingly, the difference in results is conceptually consistent with urban areas having a more diversified production base and the rural areas more likely to be outside of the relevant diversification cone.

  18. This is not reported but is available upon request.

  19. To see this note that \( \frac{ - 2.08}{ - 0.307} \approx 7 \).

  20. It is interesting, however, that during the period of rising inequality in Mexico (1987–1994), we do see divergence of the less-educated groups and convergence of the more educated groups. After NAFTA, however, the differences in convergence/divergence trends are very small.

  21. We define “border” to be all of Mexico’s states that border with the United States which includes Baja California, Sonora, Chihuahua, Tamaulipas, and Coahuila. When we employ the whole sample, we use all wages from these states which include those from rural areas. When we employ the urban sample, we only use selected cities which include large border towns such as Tijuana and Juarez.

  22. It is important to bear in mind that this triple-difference exercise may not fully neutralize the effects of Great Recession if it impacted the border region of Mexico more than the interior. This would mean that this exercise overstates the effects of FDI on wage convergence. However, our conclusion is that FDI does not appear to narrow the Mexico–US wage differential and, so our conclusion would only be strengthened in the presence of this bias.

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Acknowledgments

We thank participants at the University of Hawaii Applied Micro Workshop, the Pacific Conference for Development Economics at UCLA, The LBJ School at the University of Texas at Austin, Tulane University, the Bush School at Texas A&M, the Chicago Fed and the Western Economic Association 2015 meetings in Honolulu for useful feedback. Finally, we would like to thank Kristin Butcher, John Kennan, and David McKenzie for useful discussions. This paper we previously circulated under the title “Globalization and Wage Convergence: Mexico and the United States”.

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Correspondence to Raymond Robertson.

Appendices

Appendix 1

See Table 8.

Table 8 Alternative wage measurements in the Mexican census

Appendix 2: Alternative wage measurements

In the paper, we convert Mexican wages to 1990 dollars by, first, converting the wage to US dollars using the nominal exchange rate for that year and then by deflating the wage to 1990 US dollars using the US CPI. An alternative (and equally viable) procedure would have been to deflate the Mexican wages to 1990 pesos using the Mexican CPI and then converting the wage to 1990 dollars using the nominal exchange rate from 1990. We call the wage that results from the former method MX Wage 1 and the wage that results from the second method MX Wage 2.

The comparisons of MX Wage1 and MX Wage2 using the census data are reported in Table 9. The comparison of the mean value across cohorts of the two measures over time are shown in Fig. 11. As can be seen, the wages are very similar using the two methods of comparison. The raw correlation between the two in the census data is 0.9985 and 0.6936 in the household data indicating that it makes little difference if we use MX Wage 1 or MX Wage 2.

Table 9 Mean US wages including and excluding Mexican migrants
Fig. 11
figure 11

Comparing two deflating measures in the household data. Notes The deflated Mexican pesos is the mean of the log of the Mexican monthly earnings deflated by the Mexican price index. The deflated US Dollars is the dollar value of Mexican monthly earnings deflated by the US CPI (1990 = 1)

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Gandolfi, D., Halliday, T. & Robertson, R. Trade, FDI, migration, and the place premium: Mexico and the United States. Rev World Econ 153, 1–37 (2017). https://doi.org/10.1007/s10290-016-0260-2

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