I'll gather the latest evidence on how unions affect workers and the broader economy.
Labor unions have both positive and negative effects, with the balance depending on whether you look at individual workers or the broader economy, and on how unions are structured.
1. For Workers: Generally Positive
Most economic research finds unions improve conditions for their members:
•Higher wages - the "union wage premium": In 2024, union workers earned median weekly wages of $1,337 versus $1,138 for non-union workers — a 17.5% premium. Other estimates find:
•Bureau of Labor Statistics data for 2023 found union members earned 15.9% more on average than nonunion counterparts
•The Economic Policy Institute finds a worker covered by a union contract earns 12.8% more in wages than a peer in a nonunionized workplace in the same industry with similar education, occupation and experience
•A 2003 paper found unions raise wages of unionized workers by roughly 20% and raise compensation including both wages and benefits by about 28%
•Reduced inequality, especially for lower-paid workers: Unions reduce wage inequality because they raise wages more for low- and middle-wage workers than for higher-wage workers, more for blue-collar than for white-collar workers, and more for workers who do not have a college degree. They also set a pay standard that nonunion employers follow.
Specific EPI findings:
•Black workers represented by a union are paid 12.6% more than nonunionized Black peers, and Hispanic workers 16.4% more
•Wages for women represented by a union are on average 9.8% higher than those of nonunionized women with comparable characteristics
•Spillover benefits for non-union workers: When union density is high, nonunion workers benefit too because unions effectively set broader standards — including higher wages — which nonunion employers must meet to attract and retain workers. Research on union decline found nonunion men would be earning 5% more per week if union membership had remained at its 1979 level.
•Better benefits, safety, and fiscal effects:
•More than nine in 10 unionized workers have access to employer-sponsored health benefits compared with just 71% of nonunion workers. Union employers also contribute more toward health care and retirement, and are more likely to offer paid sick days, vacation and more predictable schedules.
•Union membership yields a positive "net fiscal impact" — unionized workers have more income and therefore pay more taxes, and need fewer public benefits. A Washington state study found unions raise workers' wages and benefits, and reduce the use of public assistance, benefiting both the state's economy and worker well-being.
•So-called right-to-work legislation that weakens unions has been associated with a roughly 14% increase in the rate of occupational fatalities. Higher unionization is also associated with better health outcomes.
•Broader community effects: From a Keynesian standpoint, unions make sure workers have enough money to live and purchase goods needed to keep the economy going, raise wages at non-union facilities, improve workplace safety, and help close wage gaps for women and workers of color.
An EPI study found in recent years:
•In high-union-density states, 2023 median household income was on average more than $12,000 higher than in low-union-density states
•The share without health insurance was 5.7% vs 9% in low-density states
2. For the Overall Economy: Mixed and More Contested
Economists are more divided on the aggregate effect:
Potential negative effects cited by critics and some empirical literature:
•Labor cartel view: Heritage Foundation and other critics argue unions function as labor cartels that restrict the number of workers in a company or industry. While they sometimes achieve benefits for members, they harm the overall economy, raising wages for members by forcing consumers to pay more or costing some workers their jobs.
•Slower job growth, investment and productivity: A 2025 Mercatus Center review of 147 studies concluded powerful labor unions can lead to slower job growth and fewer jobs for unionized workers, reduce company investments in research and development, and increase likelihood of company closures.
The Mercatus abstract summarized: although US unions have historically secured short-run pay gains, these victories often come at the expense of slower employment growth, fewer future job opportunities, reduced investment and productivity, and diminished firm growth and viability.
•Case study - Rust Belt: Researchers found dynamics linked to monopoly bargaining explain roughly 55 percent of the decline in the Rust Belt's share of manufacturing employment between 1950 and 2000.
•Other drawbacks commonly cited: Decline in competitive advantage for American companies, corruption, potential decrease in productivity, possible reduction in employee motivation, and increased inefficiencies. Unions can prevent entry of workers into an industry, causing higher wages than competitive equilibrium and deadweight loss.
Why structure matters:
The same Mercatus review argues the negative effects are not due to collective voice itself, but to statutory monopoly structures in the US that grant a single certified union exclusive authority to represent all workers in a bargaining unit. Cross-country evidence shows systems permitting multiple forms of representation, voluntary unions, and flexible agreements — as in Germany and the United Kingdom — retain benefits of worker voice without high costs.
US unions tend to be more powerful and adversarial than those in Germany and the UK, which operate within frameworks encouraging greater flexibility, worker representation and collaboration with employers.
When unions pursue moderate, balanced demands over time, they are more likely to sustain long-term benefits for both workers and companies.
3. Bottom Line
•For individual workers who are members, especially lower-wage, blue-collar, women and minority workers: Evidence is strong that unions raise wages, improve benefits, enhance safety, and reduce inequality.
•For non-union workers and communities: Higher union density tends to lift wages and standards for everyone and is associated with higher median incomes and better benefits coverage.
•For firms and aggregate economic growth: Unions can raise labor costs, reduce flexibility, and if demands are perceived as excessive, lead firms to cut R&D and capital investment, slow hiring, or close plants. The net effect depends on bargaining power, industry competition, globalization, and labor law design.
In short, unions are clearly beneficial for workers' compensation and working conditions, while their economy-wide effect is a trade-off between higher and more equal compensation and potential costs in employment growth, investment, and firm competitiveness — a trade-off that research suggests is smaller when unions operate as cooperative, flexible worker-voice institutions rather than as monopoly bargaining agents.