Factor Markets

Factor Markets

🟢 Lite — Quick Review (1h–1d)

Rapid summary for last-minute revision before your exam.

Factor markets are where the services of factors of production — land, labour, capital, and entrepreneurship — are bought and sold. Households supply these services and firms demand them. Factor prices emerge as wages (labour), rent (land), interest (capital), and profit (entrepreneurship).

The hiring rule every ICAN candidate must memorise is MRP = MRC, measured in Naira. A firm maximises profit by hiring each factor up to the point where the extra revenue from the last unit equals the extra cost of employing it.

• Derived demand: factor demand comes from demand for the final good, so a fall in product price shifts MRP leftward via MRP = MPP × P.
• Ricardian rent on land is a surplus because land supply is perfectly inelastic in the long run.
• Monopsony wage sits below MRP — the classic exploitative gap examiners love to test.

🟡 Standard — Regular Study (2d–2mo)

Standard content for students with a few days to months.

Demand and supply of factors

Factor demand is derived demand: firms hire inputs only because consumers want the goods those inputs produce. The individual firm’s demand curve for a factor is its downward-sloping MRP curve. The market demand curve for labour, however, can slope upward when substitutes and scale effects dominate.

Pricing the four factors

Factor	Price paid	Determinant of price
Land	Rent	Inelastic supply; price = MRP of land
Labour	Wage	Wage = MRP_L under perfect competition
Capital	Interest	Loanable funds market (S = I)
Entrepreneurship	Profit	Residual after other factors are paid

Profit-maximising employment rule

A firm in a competitive factor market hires until MRP = MRC. Because factor markets in Nigeria often feature a single large employer (e.g. a dominant textile mill hiring all textile workers), the monopsony model is heavily examined.

• Under perfect competition: W = MRP_L, so workers capture the full value of their marginal output.
• Under monopsony: the firm faces an upward-sloping labour supply curve, so MRC > W; it hires where MRC = MRP_L and pays the wage read off the supply curve, leaving W < MRP_L.
• Introducing a minimum wage above the monopsony wage but below MRP_L can simultaneously raise W and increase employment — a counter-intuitive result ICAN questions frequently set.

🔴 Extended — Deep Study (3mo+)

Comprehensive coverage for students on a longer study timeline.

Worked micro-example

Suppose a Lagos bakery’s bakers have MPP = 10 loaves per hour and each loaf sells for ₦1,500. Then MRP = 10 × ₦1,500 = ₦15,000 per baker-hour. If the marginal resource cost of an extra baker is ₦12,000, the firm should hire more bakers because each extra unit adds ₦15,000 of revenue against ₦12,000 of cost. If bread price falls to ₦1,000, MRP drops to ₦10,000, and the firm sheds workers until MRP again equals MRC.

Common mistakes and traps

Mistake	Correction
Confusing MPP with MRP	MRP = MPP × P or MPP × MR; always in Naira
Stating MRP = ATC at equilibrium	Correct rule is MRP = MRC, not average cost
Treating land rent as a cost of production	Ricardian rent is a surplus payment, not a production cost
Assuming monopsony wage exceeds MRP	Wage is below MRP under monopsony; the gap is the exploitation margin

Edge cases and adjacent links

• Bilateral monopoly (one union, one monopsonist) produces an indeterminate wage — settled by bargaining power rather than market forces.
• Quasi-rent applies to capital goods whose supply is fixed in the short run; long-run supply is elastic.
• Factor mobility between Lagos and Abuja (regional labour markets) determines how quickly wage differentials close — relevant to Nigeria’s structural unemployment debate.

Practice prompts

1. Derive the firm’s demand curve for a factor from MRP = MRC.
2. Explain why a minimum wage above the monopsony wage can raise both wage and employment.

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