Trade unions and their relative bargaining power on wage determination

Microeconomic Decision‑Makers – Workers

Trade Unions & Their Bargaining Power on Wage Determination

Think of the labour market as a big team sport – the players (workers) and the coach (employer) must agree on the playbook (wages). Trade unions are like a team captain who talks to the coach on behalf of the players. Their power depends on how many players they can rally and how much the coach values their support.

Analogy: The Negotiation Game

Imagine a game of “Monopoly” where each worker is a player. The union is the bank that can offer a better deal if enough players agree. If the bank (union) has many players (members), it can demand higher rent (wages). If only a few players join, the bank has less leverage.

Factors That Boost Union Power

1. High Membership: More workers = stronger voice.
2. Industry Concentration: In sectors with few employers, unions can negotiate better terms.
3. Legal Protection: Laws that protect the right to unionise increase bargaining power.
4. Economic Conditions: In a tight labour market, unions can push for higher wages.

Wage Determination – A Simple Model

The union’s wage demand can be represented as: $$ w_d = \bar{w} + \alpha (1 - \theta) $$ where $\bar{w}$ is the market wage, $\alpha$ is the union’s strength, and $\theta$ is the proportion of workers not in the union.

The employer’s cost function is: $$ C(w) = w \cdot L + \phi $$ where $L$ is labour hours and $\phi$ is fixed costs. The equilibrium wage is where the union’s demand meets the employer’s cost curve.

Real‑World Example: The UK Teachers’ Union

The National Union of Teachers (NUT) represents about 30% of teachers. In 2023, they negotiated a 2% pay rise, which was higher than the market average of 1.5%. The union’s strong membership and the public importance of education gave them high bargaining power. 📚