Are labor unions good for workers and the economy?

This is a genuinely contested question in economics, with substantial evidence on both sides. Here's a balanced look at what research shows:

Arguments that unions benefit workers

Higher wages. The most well-documented union effect is the "wage premium." While simple comparisons of the wages of union workers and nonunion workers find that union workers typically make about 20 percent more than nonunion workers, economists turn to other types of analysis to capture causal effects of unions on wages. After controlling for worker characteristics, the evidence from these two approaches points to a union wage premium of around 10 to 15 percent, with larger effects for longer-tenured workers. A separate 2024 analysis using BLS data found the union wage premium for all workers is 10 percent—meaning workers who join a union can expect to see a 10 percent increase in their weekly earnings.

Recent wage growth. During the 2019–2024 period, real wages declined for most workers, on average, except for union-affiliated workers in the service-providing sector. Similarly, nominal wage growth of union workers increased more rapidly, leading to higher real wage growth and compensating for lost ground from previous years.

Reducing inequality. Cross-country research finds a negative relationship between unionization and wage inequality, confirming the theoretical prediction of the inequality-reducing effect of labor unions. This happens partly because within a given industry, unions can reduce the dispersion of wages by standardizing pay.

Broader social effects. Historically, unions have shaped major labor protections—unions helped create the 40-hour workweek, child labor laws, and improvements in health insurance. Advocacy groups argue unions also strengthen democracy by boosting wages for workers, reducing wage inequality, increasing voter turnout for union and nonunion voters alike, and providing a counterbalance to wealthy interest groups.

Effects don't seem to be fading. Despite declining union membership over decades, one 2024 NBER study found the mark-up unions achieve over comparable non-union wages has not shown a secular decline even as union density has fallen—the short answer is no.

Higher education sector evidence. In academia specifically, unionization increases salaries on average by 2 percent in the first year post-unionization and by 6 percent after 6 years, and importantly researchers did not find any negative impacts on employment, tuition or government transfers — addressing a common worry that unionization costs jobs.

Where the debate gets more contested

Bottom line

The empirical consensus among labor economists is fairly strong that unions raise wages for their members—typically by roughly 10–15%—and tend to compress wage inequality, particularly when they organize lower-paid workers. Evidence on employment/output effects is more mixed and context-dependent: some sectors show no job losses from unionization, while economic theory and some studies suggest possible trade-offs in more competitive, price-sensitive industries. Broader claims about unions' effects on democracy, health, and community well-being are actively researched but less settled than the wage findings. In short: unions are well-supported as beneficial for the workers who join them — the more contested question is their net effect on the overall economy, where the answer likely depends on industry, market structure, and how "good for the economy" is defined (efficiency vs. equity, short-run vs. long-run).