Labor Economics Consensus: Skill-Group Effects and the NASEM Report
To move beyond the highly localized Mariel Boatlift debate, labor economists have conducted aggregate and sector-specific analyses of how immigration affects native wages and employment. The consensus literature emphasizes that the overall impact of immigration on the average native-born worker is very close to zero, but that this average conceals important differences across skill groups, time horizons, and sectors.
The NASEM Consensus Report (2017)
The most comprehensive adjudication of this evidence is the 2017 report by the National Academies of Sciences, Engineering, and Medicine (NASEM), titled The Economic and Fiscal Consequences of Immigration. The panel of economists concluded that:
- Average Impact: When measured over a period of 10 years or more, the impact of immigration on the wages and employment of native-born workers overall is very small.
- Subgroup Vulnerabilities: The negative wage and employment effects of new immigration are concentrated among two specific groups:
- Prior Immigrants: Because prior immigrants are the closest substitutes for new arrivals in terms of skills, language proficiency, and sector concentration, they experience the most direct wage competition.
- Native-Born High School Dropouts: Some evidence suggests that native-born workers who did not complete high school experience short-run negative wage pressures, particularly in areas with high concentrations of low-skilled immigrants.
- High-Skill Complementarities: High-skilled immigration (such as H-1B visa holders in technology and engineering) has a positive complementary effect, raising the wages and productivity of college-educated native-born workers and spurring innovation.
Short-Run vs. Long-Run Dynamics
A key distinction in labor economics is the time horizon. In the short run, a sudden influx of labor can depress wages in specific sectors because capital (e.g., machinery, buildings, land) is fixed. In the long run, however, capital adjusts. Businesses invest more to take advantage of the larger labor pool, and the overall demand for labor rises, neutralizing the initial downward wage pressure. Furthermore, immigrants are not just producers; they are consumers whose demand for housing, food, and services expands the local economy and creates new jobs.
Sector-Specific Impacts
The effects of immigration are most heavily concentrated in specific sectors:
- Agriculture: This sector relies heavily on immigrant labor for harvesting and processing. As seen in the Agriculture Market View, major agribusinesses like Archer-Daniels-Midland (ADM, $38.45B market cap) and Bunge Global (BG, $23.92B market cap) operate in highly globalized supply chains where agricultural labor supply directly impacts production costs and competitiveness.
- Construction: Immigrant labor is a significant component of the construction workforce. Large infrastructure and materials companies like Caterpillar (CAT, $403.42B market cap) and Vulcan Materials (VMC, $36.71B market cap), profiled in the Construction Market View, are highly sensitive to labor availability and wage rates, which dictate project costs and profit margins (ranging from 12.7% to 18.2% for major construction constituents).