モノプソニー

A monopsony is a market structure with a single buyer facing many sellers, the opposite of a monopoly where one seller dominates. While monopolies reduce output and raise prices, monopsonies reduce the price paid to sellers and lower transaction quantity. Both distort free markets but affect different sides: monopolies control supply, monopsonies control demand.

As the sole buyer, a monopsonist controls demand and can negotiate quantity, price, and trade terms because sellers have no alternatives. This concentrated buyer power enables the monopsonist to purchase goods or services at lower prices than in competitive markets, directly suppressing seller income and reducing market supply.

Monopsonies are particularly common in labor markets where a single employer dominates employment in a specific area or industry. They also occur in markets for raw materials, components, and other goods where buyer power is concentrated, such as with large retailers like Amazon and Walmart exercising monopsony power over suppliers.

Monopsony power reduces seller income and can lead to underproduction and lower quality of goods or services. This market inefficiency harms both producers and consumers who receive less for their goods or labor. The monopsonist maximizes profit where marginal cost of input equals marginal revenue product, typically resulting in lower quantity and price compared to competitive markets.

Monopsonies offer advantages such as cost savings through negotiations, simplified processes, and market stability for the buyer. However, potential drawbacks include reduced competition and adverse effects on suppliers. The overall impact varies based on industry dynamics and the degree of buyer concentration in specific markets.

Governments may intervene through minimum wage laws, collective bargaining rights, or public policy toward monopolies antitrust laws to counteract monopsonist market power. These policy interventions aim to address inefficiencies and inequities created by concentrated buyer power, protecting producers from suppressed prices and reduced supply.

In labor markets with a single dominant employer, monopsonies enable the employer to negotiate lower wages and control labor conditions. This concentrated employer power suppresses worker compensation and reduces employment quantity. Understanding monopsony dynamics is crucial for analyzing labor markets where employment opportunities are limited to one major buyer.