The Trade Shock That Created Jobs Without Raising Wages
This series examines a specific question in the Mexican economy: what happened to municipalities whose export baskets matched the products made more expensive by the United States’ tariffs on China? The question matters because trade diversion is often described as a national story about factories moving from one country to another. The evidence from Mexico points to something more local and more complicated. Export opportunities reached places that already had the right production links, and the first labor-market response was mainly more jobs and more formal work—not a statistically significant rise in average labor income. To understand that result, we need to follow the chain from the U.S.–China dispute to Mexican exposure, exports, employment, and the limits of the comparison.
The dispute was between Washington and Beijing, but the opportunity appeared in Mexico
The immediate shock began with the escalation of U.S. trade restrictions on China in 2018 and 2019. The United States introduced several rounds of tariffs and other measures affecting approximately $350 billion of Chinese imports. The paper reports that the average U.S. tariff on imports from China rose from about 3 percent at the end of 2017 to 20 percent by 2019. Tariffs on imports from Mexico, by contrast, remained unchanged over the comparison. That difference altered the competitive position of suppliers in the U.S. market.
A tariff does not need to be imposed on Mexico to create an opening for Mexican firms. If a U.S. buyer can obtain a product from China or Mexico, and the Chinese version becomes more expensive because of a tariff, the Mexican version becomes relatively more attractive—provided Mexican producers can meet the price, quality, volume, delivery, and regulatory requirements. The opportunity is therefore not automatic. It depends on whether a country already has the capacity and market connection to respond.
Two possible mechanisms sit inside the broad label “nearshoring.” A multinational company may relocate some production from China to Mexico to reduce exposure to tariffs, geopolitical risk, or long supply chains. Alternatively, firms already operating in Mexico may expand output to substitute for Chinese exports that have become less competitive in the United States. Both mechanisms can raise Mexican exports, but neither is identical to simple transshipment. A shipment passing through Mexico would change trade statistics without necessarily creating Mexican production or local jobs.
Mexico had several conditions that made a response plausible. It is geographically close to the United States, deeply integrated into North American production networks, and connected to the U.S. market through the trade framework that followed NAFTA, including USMCA. Yet these national advantages do not tell us which places inside Mexico benefited. A border state, a central manufacturing municipality, and a rural locality without established export activity did not face the same practical opportunity. The relevant question is not merely whether Mexico was near the United States. It is whether a particular municipality was already selling the products for which the tariff shock opened room.
That is why the World Bank study focuses on local labor markets rather than stopping at national export totals. Its unit of analysis is the Mexican municipality, linked to detailed product-level exports and to labor outcomes. The subject is not “globalization” in the abstract, nor nearshoring as a promise that every factory will move. It is the uneven local adjustment produced when a large-country policy change redirects demand toward a third country.
National export growth can conceal this unevenness. A country may sell more to the United States while some towns gain factories, others gain service demand, and many see little change because they do not produce the affected goods. The local level also changes what “benefit” means. An increase in exports is not yet an increase in household welfare; it becomes a labor-market question only when we ask who is hired, whether jobs are formal, whether existing workers earn more, and whether new arrivals alter the local denominator. The municipality is therefore not just a smaller geography. It is the place where an international price change meets institutions, firms, workers, and local demand.
This perspective also guards against a tempting but incomplete story. If Chinese products become more expensive in the United States, Mexico does not automatically inherit the displaced production. Firms must be able to deliver the relevant product, and buyers must be willing to switch suppliers. A tariff creates room in the market; it does not fill that room. The study's focus on prior export baskets is important precisely because it asks which places were positioned to use the room before the shock arrived.
The labor-market result is not the one “more trade” usually implies
The surprising result appears when the export opportunity is translated into labor-market measures. In municipalities more exposed to the U.S. tariffs on Chinese goods, a 1 percent increase in tariff exposure was associated with a 5.6 percent increase in total labor income. That sounds like a broad improvement, but total labor income is the sum of what all workers in the municipality earn. It can rise because more people are working, because each worker earns more, or because both happen together.
In this case, the paper finds that the main channel was job creation. A 1 percent increase in exposure was associated with about a 6.3 percent increase in the total number of employed people, while average labor income did not change significantly. The distinction is crucial. “Wages did not rise” is a fair short description of the average-income estimate, but it should not be stretched into the claim that no worker gained or that the new jobs were no better than the old ones. The measured gain came largely through the extensive margin: more people entered or found work. The intensive margin—average earnings per worker—did not show a statistically reliable increase in the study’s period and measure.
The arithmetic is simple but often lost in public discussion. Imagine a municipality in which the same average amount is earned per worker, but the number of workers rises because firms add positions and people move in. Total labor income rises even though the average does not. If the new positions also provide pension or retirement benefits, formalization improves without requiring a large movement in pay. This is why the study reports several labor outcomes separately rather than treating “the labor market” as a single score. Employment count, employment rate, total income, average income, and informality answer different questions about the same adjustment.
The composition of work changed as well. The largest total-income responses appeared among semi-skilled and unskilled workers. Semi-skilled workers also experienced a significant increase in their employment rate. And informality fell: the paper measures informality as the share of workers without pension or retirement benefits, and estimates that a 1 percent increase in exposure reduced the overall informality rate by 0.25 percentage points. The abstract describes the newly created jobs as disproportionately formal. That is a job-quality improvement even when average pay is flat.
There is a further reason not to read the result as a simple wage story. More-exposed municipalities appear to have attracted working-age migrants. New jobs can draw people into a locality, increasing employment and total income while also enlarging the group over which average outcomes are calculated. Migration is not a footnote to the mechanism: it is one way a local trade shock becomes a population and services shock. It may spread the opportunity, but it can also make per-worker gains less visible.
The study also reports positive spillovers into services. Manufacturing is the main direct channel, but a larger manufacturing workforce can increase demand for transport, food, repair, retail, housing, and other local services. This does not mean every service worker benefits equally, or that agriculture receives the same impulse. It means that the labor-market effect can extend beyond the factory floor through local demand, while remaining rooted in the municipality’s connection to manufacturing exports.
The diagram captures the central tension without turning it into a paradox. A trade shock can expand the number of people earning labor income without increasing the average amount earned by each worker. It can also improve formal coverage while leaving open the harder questions about productivity, investment, and long-run wages.
What this case asks us to distinguish
The Mexican evidence supports a narrower and more useful conclusion than “trade creates prosperity.” A foreign tariff shock created a relative opportunity in the U.S. market. Municipalities with prior exposure to the affected product lines were positioned to capture more of it. Their export growth was followed by more employment, lower informality, and service-sector spillovers. Average labor income, however, did not rise significantly. Each part of that sentence describes a different link in the chain; none should stand in for all the others.
The same discipline applies to the word “nearshoring.” The observed export and labor responses are consistent with production being redirected toward Mexico, but the study does not show that every export increase came from a newly relocated factory. Nor does it establish that the gains reached all of Mexico. The estimation sample contains 186 municipalities that exported manufactured goods to the United States during the base period. Those municipalities represent a substantial share of Mexican manufacturing exports and population, but they are selected toward places with stronger export and labor-market outcomes. Confidentiality rules also exclude some small trade flows and firms that are the only or one of very few exporters in a locality.
That selection is not merely a technical nuisance. It helps explain both why the measured response could occur and why it cannot be generalized casually. A municipality that already exports manufactured goods has firms, workers, customs connections, and relationships with buyers that a non-exporting locality may lack. The study's comparison is therefore most informative about export-connected local labor markets. It does not tell us that a remote locality with no relevant production base would receive the same opportunity simply because it is inside the same country.
So the practical judgment supported by this case is conditional. Trade diversion can create jobs without raising average wages when an external price shock meets existing productive capacity and market access. That is a real economic opportunity, not a statistical illusion. But it is not yet the same as broad-based development. To turn a temporary advantage into durable gains, Mexico would need the capabilities that allow firms to move beyond assembly and respond reliably: skills, logistics, customs performance, transport, and predictable rules for investment. The paper identifies those as enabling conditions and future policy questions, not as reforms tested by the study.
The distinction between opportunity and transformation is especially important because a trade shock can be temporary. Tariffs may change, competitors may adapt, and firms may decide that the first wave of orders is not worth a permanent investment. A durable shift would require evidence that firms built new capacity, workers gained productivity and bargaining power, local suppliers deepened, and wages eventually moved—not just that exports and headcounts rose during the adjustment window. Mexico's experience makes those questions more precise; it does not answer them in advance.
The next step is to see how the researchers measure unequal exposure across municipalities. Once that measure is clear, the export results can be read as evidence about a defined local comparison rather than as a general claim about what tariffs or globalization do everywhere.