Are labor unions good for workers and the economy?

This is a genuinely contested question in economics, with credible research and advocacy on multiple sides. Here's a balanced summary of the evidence:

Where research broadly agrees

Unions raise wages for their members. On average, 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 a similar education, occupation, and level of experience, according to EPI's analysis of BLS data. Other estimates put the raw premium even higher: simple comparisons of the wages of union workers and nonunion workers find that union workers typically make about 20 percent more than nonunion workers.

Unions reduce inequality. Most importantly, from a societal point of view, unions reduce pay inequalities—they increase the relative pay of lower skilled workers, and help to establish pay norms that extend beyond unionised companies. Research by Bruce Western and Jake Rosenfeld found the decline of unions from 1973 to 2007 explains up to one-third of rising wage inequality among men and one-fifth of rising wage inequality among women.

The productivity effect is mostly neutral-to-positive. In the most comprehensive review of the literature — a survey of over 300 studies by Harvard economist Richard Freeman and colleagues — the global evidence from more than 300 studies on the economic impact of unionisation shows unions do not, overall, reduce productivity, though it varies according to specific circumstances. Separate research finds in the United States, unions generally have a positive impact on productivity, and this effect is particularly strong among manufacturing firms, partly because they are avenues for workers to express wage and benefit preferences, but they can also allow employees to notify managers about inefficiencies within company policies and the production process.

Unions cut into profits. Even researchers sympathetic to unions acknowledge unionisation does make businesses less profitable for the owners, since higher wages come at the expense of the surplus otherwise captured by shareholders.

Non-wage benefits are real. There is strong evidence that unions improve both fringe benefits and non-wage features of the workplace... unions have had a large hand in improving work environments on many dimensions and, in doing so, raise the wellbeing of workers and their families.

Where researchers disagree sharply

Employment effects. Critics argue unions act like cartels that price some workers out of jobs. The Heritage Foundation contends unions function as labor cartels, restricting the number of workers in a company or industry to drive up the remaining workers' wages... they benefit their members but hurt consumers generally, and especially workers who are denied job opportunities... unions decrease the number of jobs available in the economy. NBER research on international data supports part of this concern, finding that more union involvement in wage setting significantly decreases the employment rate of young and older individuals relative to the prime-aged group.

On the other side, defenders argue this cartel framing is outdated. Heritage's own analysis notes that the economy has become more competitive over the past generation... consequently, unions do not negotiate higher wages for many newly organized workers... these days, unions win higher wages for employees only at companies with competitive advantages — suggesting the "cartel tax" story may apply less broadly than it once did.

Investment and growth. The Heritage Foundation argues unions tax investments by negotiating higher wages, thus lowering profits — unionized companies respond to this union tax by reducing investment, making unionized companies less competitive. A more recent Mercatus Center review reaches a similar conclusion about powerful unions specifically, citing the Rust Belt as a cautionary case: unions, while boosting wages in the short term, inflicted long-term economic damage — bloated labor costs and relentless strikes strangled productivity and investment, prompting manufacturers to flee... leaving workers worse off and communities struggling to recover. That paper's authors trace 55 percent of the decline in the Rust Belt's share of US manufacturing employment to union-related conflict.

Pro-union economists counter that these harms are avoidable design flaws, not inherent to unions: while stronger union power can bring long-term drawbacks... these effects are often tied to union models built around exclusive representation and limited competition rather than to collective bargaining itself.

Macroeconomic/political-economy case. The U.S. Treasury Department has argued the broader macro story favors unions: over the last half century, middle-class households have experienced stagnating wages, rising income volatility, and reduced intergenerational mobility, even as the economy as a whole has prospered... pro-union policy can make a real difference to middle-class households by raising their incomes, improving their work environments, and boosting their job satisfaction — in doing so, unions can help to make the economy more equitable and robust.

Bottom line

There's fairly strong consensus that unions raise wages and benefits for their own members and reduce wage inequality, without clearly hurting (and sometimes helping) firm-level productivity. The genuine debate is over second-order effects: whether those gains come partly at the expense of non-union workers' job opportunities, and whether strong, monopoly-style union power can drag down investment and long-run growth in specific industries (the Rust Belt being the classic contested case). Economists on the left (EPI, CAP, Treasury under the Biden administration) tend to emphasize the equality and middle-class benefits; economists on the right and some industry-focused analysts (Heritage, Mercatus) emphasize job losses and competitiveness costs from concentrated union power. Most serious empirical reviews land somewhere in between — unions are neither a costless win for the economy nor a pure economic drag, and outcomes depend heavily on industry, country, and how union bargaining power is structured.