How U.S. investments in Mexico have increased investment and jobs at home 
The effect of the transfer of operations from the United States to Mexico by transnational companies has been widely documented. Various studies show that the benefit to employment, sales and investment has been mutual. The results of one of those studies are set out here.
Por: Theodore H. Moran and Lindsay Oldenski

Enactment of the North American Free Trade Agreement (NAFTA) 20 years ago was accompanied by dire predictions that an increase in United States (U.S.) investment in Mexico would lead to job losses and investment reduction at home. The rhetorical highpoint for this concern was captured by H. Ross Perot’s assertion in the 1992 presidential campaign that NAFTA would create a “giant sucking sound” as U.S. jobs and investors rushed south of the border.

But that warning overlooked the possibility that foreign direct investment (FDI) and job creation abroad are complements to investment and job creation at home, that offshoring strengthens the competitiveness of the U.S. outward investor (leading to both substitution for and enhancement of home country economic activity), and that the complementary effects may be even greater than the substitution effects.

This essay builds on our recent Peterson Institiute for International Economics (PIIE) Policy Brief, The U.S. Manufacturing Base: Four Signs of Strength, which presents empirical evidence that increased offshoring by U.S. manufacturing multinational corporations (MNCS) —a phenomenon criticized for contributing to domestic job losses— is actually associated with greater overall investment and an increase in jobs at home. This update focuses on the subset of U.S. firms that offshore to Mexico. We find that they too use their foreign activities to complement, and not just substitute for, their employment, sales, investment, and exports in the United States, with the net result not a loss but an increase in jobs and investment at home that can be directly linked to investment abroad.


Profile of U.S. Direct Investment in Mexico


In 2012, Mexico was only the 23rd largest recipient of FDI worldwide, but it was the 11th largest destination for investment by U.S. firms. In 2011 (the most recent year for which detailed data are available), affiliates of U.S. firms in Mexico sold 252 billion dollars worth of goods and services, and employed 1.3 million Mexican workers.

Figure 1 shows that the volume of sales by U.S. MNCS, both sales that originated in the United States and those sold by affiliates of U.S. firms in Mexico, has grown over two decades. Sales by affiliates of U.S. firms in Mexico grew from about 32 billion dollars in 1990 to 252 billion dollars in 2011. In 1990 these sales were 2.2% of sales by U.S. MNCS that originated in the United States, and in 2011 they were 3.6% of U.S.-based sales. Foreign and domestic sales by U.S. MNCS follow similar trends, with the rate of growth varying with times of overall economic growth and contraction.



Figure 2 shows the employment trend by U.S. MNCS in the United States and at their affiliates in Mexico over the same time period. Employment by affiliates of U.S. firms in Mexico grew from about 553,000 workers in 1990 to 1.34 million in 2011. Employment in Mexico went from 3% employment by U.S. MNCS in the United States to 5.9% employment by U.S. MNCS in the United States in 2011. As was the case with sales, it is clear from Figure 2 that employment by U.S. MNCS in the United States and Mexico both follow similar trends, with the rate of growth varying with times of overall economic growth and contraction.



Trade between U.S. MNCS and their affiliates in Mexico has also grown since the signing of NAFTA. Trade in both directions increased rapidly in the second half of the 1990s, and was close to being balanced during that period. In the early 2000s, U.S. MNCS imported more from their affiliates in Mexico than they exported to them, though the trade gap began to narrow in 2008.

U.S. firms with affiliates in Mexico operate in a variety of different industries. Not surprisingly, given the extent of offshoring by U.S. auto companies, the largest of these is transportation equipment, which includes automobile manufacturing. The Table provides details on the 15 largest industries, ranked by the number of workers employed by U.S. MNCS in Mexico in 2011.


What Happens to U.S. Firms’ Domestic Operations When They Invest Abroad? The Case of NAFTA


Figures 1 to 3 show that investment by U.S. MNCS in Mexico has increased since the signing of NAFTA. But has this expansion come at the expense of investment and employment in the United States? To disentangle the extent to which MNC activity at home and abroad are substitutes or complements, we examine detailed microdata on how individual firms behave over time. The U.S. Bureau of Economic Analysis (BEA) collects confidential firm-level data on the activities of U.S.-owned multinationals, both at home and at their foreign affiliates. All U.S.-owned firms with at least one foreign affiliate that meet a minimum threshold by size are required by law to provide this data to the BEA. These data allow us to examine what happens to domestic employment, sales, capital investment, and exports in the United States when an individual firm expands its FDI activities. Obviously many other factors such as recessions, industry trends, and idiosyncratic firm decisions will also affect the domestic operations of U.S. firms. For this reason, we employ panel regression methods that allow us to control for those factors and isolate the direct relationship between foreign expansion and domestic outcomes at U.S. firms.



These methods use data on all U.S. MNCS with foreign affiliates in Mexico. We include firm fixed effects, which allow us to examine changes within each firm over time, rather than comparing one firm to another. Firm “fixed effects” hold constant everything that is unique about a given firm, isolating how its employment in the United States and the other variables we examine change when the firm increases its outward FDI. Thus all the characteristics that define a given firm —such as the industry it operates in, its size, its relative market power, etc.— are controlled for, allowing us to focus only on the relationship between offshoring and the domestic activities of U.S. firms.

We also include year fixed effects, a technique that controls for the potential impact of recessions and booms (controlling for such impacts is particularly important in light of the severe Mexican currency crisis shortly after NAFTA was signed). Just as firm fixed effects hold constant firm characteristics, year fixed effects hold constant everything external to the firm that was going on in a given year. The only way to truly identify a causal effect between foreign and domestic activity would be to randomly assign some U.S. firms to become multinationals, while forcing others to remain purely domestic. This type of pure experiment is neither possible nor desirable. Using the fixed effects methodology is the next best option, however. This approach controls for everything that is unique about a given firm and looks at changes within each firm over time, rather than drawing conclusions based on observed behaviours across very different firms.

Figure 4 summarizes the relationship between U.S. MNC activities at home and in Mexico. These results draw on firm level data from 1990 through 2009, covering hundreds of U.S. MNCS and their more than 1,000 affiliates in Mexico.

The first thing to note about these results is that they all show a positive impact on investment and jobs in the United States. Thus expansion in Mexico by a U.S.-based MNC is associated with domestic U.S. expansion by the same firm. The foreign operations of these firms are net complements to domestic U.S. operations. These results are consistent with the complementarities that we found using all countries in which U.S. firms invest (Moran and Oldenski 2014). U.S. firms that have greater sales, hire more workers, spend more on r&d, export more goods, and invest more capital in Mexico also have greater sales, hire more workers, spend more on r&d, export more goods, and invest more capital in the United States. So the overall message is that greater investment in Mexico by U.S. firms benefits both countries.

To explain the results from Figure 4 more specifically, consider that the average U.S. firm in the sample employs 25,642 workers in the United States and 1,311 workers in Mexico. Thus a 10% increase in employment at affiliates of U.S. firms in Mexico would correspond to about 131 jobs in Mexico. Using the employment numbers from the left panel of Figure 4, this increase would be associated with a 1.3% increase in employment per MNC in the United States, or 333 U.S. jobs per firm. Accordingly, for the average U.S. firm, adding 131 jobs in Mexico would create 333 new jobs in the United States at that same firm. These relationships may be hidden by other simultaneous trends, including economic downturns, U.S. economic growth, or developments within a given industry. That is, without the benefit of econometric analysis such as ours, these relationships may be hidden within the aggregate data. But it is clear from these results that any fall in U.S. employment by U.S. MNCS is not due to offshoring to Mexico, as this offshoring exerts a net positive force on the domestic operations of U.S. firms.

These findings do not mean that certain aspects of overseas expansion never diminish similar aspects of home country MNC activity. Quite the contrary, the spread of investment and r&d, like trade in general, is likely to result in reshuffling economic activity within and among the United States, Mexico, and Canada and within and among sectors in each country. The point is that a dispassionate public policy analyst would have to conclude that the aggregate result from outward FDI on the part of U.S. firms after NAFTA is strongly positive. Conversely, the overall consequence would be less activity at home —not more activity at home— if overseas operations of U.S. MNCS had not been able to take advantage of NAFTA.



A case study illustrates this point. One of the best-selling and most successful trucks in the world has been Ford’s F-150 series. Following the completion of NAFTA, Ford redesigned the F-150 line, making the Ford Essex engine plant in Windsor, Canada, the exclusive source of the 5.4 liter, 32-valve high-performance Triton V-8 engine, and choosing Ford’s contract manufacturer, International Metals de México (immsa) of Monterrey, Mexico, as the sole supplier of the M450 chassis, using inexpensive but reliable Mexican steel alloy.

Ford’s prospects for holding its share of the truck market in subsequent years vis-à-vis the Toyota Tacoma and the Isuzu DMax, not to mention the Chrysler Dodge Ram, depend upon this NAFTA-integrated supply chain. Recently, the United Auto Workers (UAW) called for NAFTA to be “renegotiated to fix the many problems with this agreement and to stop the outsourcing of good-paying manufacturing jobs to Mexico.”1 However, the competitive fate of UAW workers at Ford’s U.S. assembly facilities actually depends on NAFTA.

Other previous studies have found results that tell a similar story. Mihir A. Desai, C. Fritz Foley, and James R. Hines (2009) use firm-level data from 1982 to 2004 to show that growth in employment, compensation, fixed assets, and property, plant and equipment at foreign affiliates of U.S. firms is associated with U.S. domestic growth in these same measures. (Similarly, Lee Branstetter and Foley [2010] find that U.S. firms that invest in China simultaneously invest more in the U.S. home market as well.)

Overall the evidence paints a picture in which outward investment is an integral part of MNC strategy to maximize the competitive position of the whole corporation, a goal for which headquarters raise the needed amount of capital from sources all around the globe. In determining where to deploy capital and where to locate production, relative costs —including relative wages and benefits (as well as relative skills and relative productivity) — play a role. But in the end, operations at home and operations abroad complement each other as the MNC parent tries to make the deployment of tangible and intangible assets more productive and more profitable.



Fears that expansion abroad may lead to contraction at home have been raised in discussions of trade agreements now on the U.S. agenda, particularly the Trans-Pacific Partnership (TPP) and the Transatlantic Trade and Investment Partnership (TTIP). But the strong complementary relationship revealed here —and in other similarly rigorous studies— means that firms, workers, and communities will likely be net beneficiaries of such market-opening and investment-widening agreements.  


“How Us Investments in Mexico Have Increased Investments and Jobs at Home,” by Lindsay Oldenski and Ted Moran Copyright © 2014 Peterson Institute for International Economics.


Theodore H. Moran and Lindsay Oldenski are non-resident senior fellows at the Peterson Institute for International Economics.


Branstetter, Lee, and C. Fritz Foley, “Facts and Fallacies about U.S. FDI in China (with apologies to Rob Feenstra),” in China’s Growing Role in World Trade, ed. by Robert C. Feenstra and Shang-Jin Wei, Chicago: University of Chicago Press in association with the National Bureau of Economic Research, 2010.

Desai, Mihir A., Fritz Foley, and James R. Hines Jr., “Domestic Effects of the Foreign Activities of U.S. Multinationals,” American Economic Journal: Economic Policy, num. 1 (February), 2009, p. 181-203.

Moran, Theodore H., and Lindsay Oldenski, “The U.S. Manufacturing Base: Four Signs of Strength,” Peterson Institute for International Economics Policy Brief 14-18, Washington, DC, 2014.




1 The quotation comes from the UAW website. Ford’s decision to shift from steel to aluminium for the F-150 will involve a new configuration in source of inputs. Available at (link is external) (accessed on July 2, 2014).