Unions are back in the spotlight — I'll dig into what the research says about their effects on workers and the broader economy.
Labor unions have both benefits and costs for workers and for the economy, and economic research is divided on the net effect. The impact often depends on the industry, the competitiveness of the market, and how the union bargains.
How Unions Can Help Workers
Proponents argue unions help workers through collective bargaining:
•Higher wages and benefits: Through collective bargaining, unions negotiate with employers to secure better pay, benefits and safer working conditions. The U.S. Treasury Department's first-of-its-kind report highlighted evidence that unions serve to strengthen the middle class and grow the economy.
•Wage premium: The report found unions raise wages of members by 10-15%. Other estimates using controls for worker characteristics and regression discontinuity find a union wage premium of around 10 to 15 percent. One 2025 analysis found unions raise average wages by 8% nationally.
•Better benefits and working conditions: Unions improve benefits, including retirement plans, paid vacation, and paid sick leave. Research finds strong evidence that unions improve both fringe benefits and non-wage features of the workplace. Benefits also include improved wages, benefits, and working conditions, increased job security, and protection against unfair treatment, including enhanced job security and protections.
•Reduced inequality: Labor unions can help reduce income inequality by promoting fair wages and benefits. Unions reduce employee turnover and wage inequality. They also enhance productivity by decreasing turnover, fostering effective communication, boosting morale, and reducing disparities in compensation. Countries with more unionization have more equality in wages and slower growth in top incomes.
•Spillover benefits for non-members: These benefits extend to non-union members as employers increase wages and benefits to attract workers. Each 1 percentage point increase in private-sector union membership rates translates to about a 0.3 percent increase in nonunion wages.
•Other benefits: Unions also contribute to social capital - union members vote 12 percentage points more often than nonunion members - and can promote training and skill formation and help retain firm-specific skills by reducing labor turnover.
Broader research cited by Treasury and others argues this supports the economy by promoting fair wages and benefits, improving working conditions, and advocating for policies that support economic development. Higher wages can lead to increased consumer spending, which drives demand for goods and services and can stimulate economic growth.
How Unions Can Hurt Workers and Firms
Critics and even some neutral analyses point to costs:
•Costs to workers: Disadvantages include union dues payments, loss of freedom, legal requirements, the financial costs of membership, and rigidity in work rules and practices. Collective bargaining can lead to wage stickiness, which can make it more difficult for employers to adjust wages in response to changes.
•Compressed wages and loss of individuality: Union contracts typically base pay and promotions on seniority, compressing wages and reducing rewards for more productive workers, and unions can discourage individuality and make it harder to promote and terminate workers.
•Exclusion: Potential disadvantages include the possibility of excluding non-union workers from gains.
Effects on the Economy Overall
The debate on the economy-wide effect is the most contested.
Arguments that unions help the economy:
•Treasury argued that increased financial stability for middle and bottom incomes could alleviate borrowing constraints, allowing workers to start businesses and build human capital, and reducing financial fragility and economic volatility. In short, unions can promote economy-wide growth and resilience.
•Unions can have a positive effect on productivity through employee engagement and union voice effects, for example by reducing staff turnover, providing training and encouraging innovation.
Arguments that unions hurt the economy:
•The Heritage Foundation and other critics describe unions as labor cartels that restrict the number of workers to drive up wages, just as OPEC attempts to cut oil supply to raise its price. They argue companies pass on those higher wages to consumers through higher prices.
•Under this view, while unions can sometimes achieve benefits for their members, they harm the overall economy.
•Higher wages may lead to reduced employment, and may contribute to higher prices and reduced competitiveness.
•Unions effectively "tax" investments in research and development or capital by negotiating higher wages, thus lowering profits, and unionized companies respond by reducing investment, making them less competitive. Economists consistently find unions decrease the number of jobs available in the economy.
•Other cited drawbacks include decline in competitive advantage, potential decrease in productivity, possible reduction in employee motivation, and increased inefficiencies.
•Critics argue unions can contribute to economic stagnation by demanding wages and benefits that exceed what employers can afford and can discourage innovation and productivity by protecting underperforming workers. Some analyses find unions have a negative impact on economic growth by increasing labor costs and reducing competitiveness.
Some researchers suggest the effect depends on moderation: more balanced, moderate, and cooperative unions are able to achieve better long-term outcomes than powerful unions that force excessive demands, preserving higher wages and better conditions while minimizing fewer jobs and less investment.
Bottom Line
•For workers who are members: Most studies find clear gains in wages, benefits, job security, safety, and workplace voice, plus reduced within-firm inequality, but at the cost of dues, less individual wage flexibility, and seniority-based rules.
•For non-union workers: There is evidence of positive spillovers (higher non-union wages in highly unionized areas/industries) and evidence that pro-union regulations can also predict lower wages for non-covered employees.
•For the economy: If unions raise wages without corresponding productivity gains, theory predicts higher prices, lower profits, less investment, and fewer jobs in unionized firms — costs borne by consumers, shareholders, and workers who are denied opportunities. If unions raise productivity, reduce turnover, and reduce inequality — which can boost consumer spending and stability — they can support growth and resilience. The net effect in empirical studies varies by time period, country, and industry, which is why Scandinavian countries with strong unions show low inequality and robust growth, while heavily unionized U.S. industries like autos have struggled against non-union competition.
In general, economists agree unions do improve conditions for many members; whether that translates to a net good for the whole economy remains debated and context-dependent.