| Definition | Organization of workers negotiating collectively for better terms. | Market with many wage-taking firms and workers, where no single entity influences wages. |
| Wage Determination | Wages are set through collective bargaining between the union and employers. Unions aim for wages above the market equilibrium. | Wages are determined by the intersection of the overall market supply ($S_L$) and demand ($D_L$) for labor. Firms and workers are wage takers. |
| Employment Levels | Unions may restrict labor supply or negotiate higher wages, potentially leading to lower employment levels (some workers priced out) than in a competitive market. | Employment levels are determined by the market equilibrium where the quantity of labor supplied equals the quantity demanded at the prevailing wage. |
| Worker Power | High; workers have collective bargaining power, acting as a single seller of labor. | Low; individual workers have no power to influence wages and must accept the market rate. |
| Firm Power | Limited by union strength; firms must negotiate with the union. | Limited by competition; firms must pay the market wage and cannot individually influence it. |
| Market Outcome | Potentially higher wages for union members, but possibly fewer jobs overall (deadweight loss). Can lead to a wage premium for unionized workers. | Efficient allocation of labor; wages reflect productivity, and employment is at its market-clearing level. |
| Example Impact on Wages/Employment | If a union bargains for a wage $W_u > W_c$ (competitive wage), employment $E_u < E_c$. This creates a surplus of labor at $W_u$. | Wages ($W_c$) and employment ($E_c$) are determined where labor supply ($S_L$) equals labor demand ($D_L$). No individual can influence $W_c$. |