Welcome to the Labour Market!
In our earlier studies, we looked at perfectly competitive markets where everything is fair and wages are set by simple supply and demand. But in the real world, things are rarely that simple! Today, we are diving into imperfectly competitive labour markets. This is where big employers or powerful trade unions have the power to influence wages and how many people get hired.
Don’t worry if this seems tricky at first—we’re going to break it down step-by-step using stories and simple logic that you can apply in your exams!
1. The Basics: What is an Imperfect Labour Market?
In a perfect market, everyone is a "wage taker." In an imperfect market, someone has the power to set the price. There are two main reasons this happens:
- Monopsony Power: There is only one main buyer of labour (the employer has the power).
- Trade Union Power: Workers join together to act as a monopoly seller of labour (the workers have the power).
Quick Review: Prerequisites
Before we move on, remember these two curves:
1. Demand for Labour: This is the Marginal Revenue Product (MRP). It’s basically the extra value a worker brings to the firm.
2. Supply of Labour: This is the Average Cost of Labour (AC). It’s the wage the firm must pay to attract workers.
2. Monopsony: The "Big Boss" Power
A monopsony occurs when there is only one dominant employer in a market. Think of a "coal mine town" where the mine is the only place to work, or the government hiring all the nurses in a country.
The Problem with Hiring More Workers
In a monopsony, if the boss wants to hire one more worker, they have to offer a higher wage to attract them. But here is the catch: they usually have to pay that new higher wage to all their existing workers too!
Because of this, the Marginal Cost of Labour (MC)—the cost of hiring that one extra person—is higher than the wage (AC) paid to that person.
An Easy Example:
Imagine you employ 10 people at \$10 an hour. To hire an 11th person, you must pay \$11. But now your original 10 workers want \$11 too!
The new worker costs you \$11, plus you pay \$1 extra to the other 10 workers (\$10).
Your Marginal Cost is actually \( 11 + 10 = \$21 \), even though the wage is only \$11.
Wage and Employment Determination in Monopsony
A profit-maximizing firm will hire workers where \( MC = MRP \).
- The firm finds the point where the cost of the last worker (MC) equals the money they bring in (MRP).
- They look down to the supply curve (AC) to see the minimum wage they can get away with paying for that many workers.
Quick Review Box: In a Monopsony:
- MC is always above AC.
- Firms hire where \( MC = MRP \).
- Workers are paid less than their MRP (this is called exploitation of labour).
3. Trade Unions: Worker Power
A trade union is an organization of workers that negotiates with employers for better pay and conditions. They act like a monopoly seller of labour.
How Unions Change the Wage
If a union is strong, they can demand a Minimum Wage. This makes the supply of labour curve go perfectly horizontal at that wage level. The employer cannot hire anyone for less than that amount.
The Outcome of Union Intervention
1. Higher Wages: The wage increases from the market level to the union-negotiated level.
2. Employment Trap: In a competitive market, a union raising wages can actually reduce employment because the firm can't afford as many workers at the higher price. This creates classical unemployment.
Memory Aid: Think of a Union like a "Price Floor" for workers. It keeps the price (wage) high, but if it's too high, there might be a "surplus" of workers (unemployment).
4. Bilateral Monopoly: A Clash of Titans
What happens when a powerful Trade Union meets a powerful Monopsony Employer? This is called a Bilateral Monopoly.
It sounds scary, but it can actually be a good thing!
- The Monopsony wants to pay a very low wage.
- The Union wants a very high wage.
They negotiate and end up with a wage somewhere in the middle. Interestingly, in this specific case, the union can actually increase both wages and the number of people employed at the same time by stripping away the employer's monopsony power!
Key Takeaway: In a bilateral monopoly, the final wage is "indeterminate"—it depends on who is better at bargaining!
5. Why do Wages Differ? (Relative Wage Rates)
Even in imperfect markets, some people earn more than others. The syllabus requires you to understand why:
- Labour Market Imperfections: Some workers have "closed shops" (you must be in a union), or employers have more information than workers.
- Differences in MRP: A skilled surgeon brings in more "revenue" (value) than a fast-food worker, so their demand curve (MRP) is much further to the right.
- Inelastic Supply: There are very few world-class pilots, but many people can work in retail. The more inelastic (scarce) the supply of a specific skill, the higher the wage.
- Discrimination: Unfortunately, some employers may pay less based on gender or ethnicity, which is a market failure and often illegal.
Common Mistakes to Avoid
1. Mixing up MC and AC: Remember, AC is the wage paid to workers. MC is the total cost of hiring one more. In a monopsony, MC is always higher!
2. Assuming Unions always cause unemployment: This is only true in competitive markets. In a monopsony, a union can actually increase employment.
3. Forgetting MRP: Always remember that the demand for labour is derived demand. Firms only want workers because those workers produce something that makes money.
Final Summary Quick-Check
Monopsony: Single buyer, \( MC > AC \), results in low wages and low employment.
Trade Union: Monopoly seller, pushes wages up, can cause unemployment in competitive markets.
Bilateral Monopoly: One buyer vs one seller. Wage depends on bargaining power.
Wage Gaps: Caused by differences in skill (MRP), scarcity of supply, and market failures like discrimination.
Great job! You've just mastered one of the more complex parts of the syllabus. Keep practicing those diagrams, and you'll do excellently!