Unit 3: Theory of Factor Pricing (A)

1. Land and Labour Markets: Basic Concepts

The factor market deals with the services of the factors of production—land, labour, and capital.

• Land: Traditionally viewed as a fixed factor of production provided by nature.
• Labour: The human effort used in the production process, whose price is determined as the wage rate.

2. Productivity of an Input and Derived Demand

Firms demand factors of production not for their own sake, but to produce goods and services that consumers want.

• Derived Demand: The demand for an input is "derived" from the demand for the final product it helps produce. For example, the demand for steel workers is derived from the demand for cars.
• Input Productivity: Refers to the output produced per unit of input. A firm’s demand for a factor depends on how much that factor contributes to the total output.

3. Marginal Revenue Product (MRP)

Marginal Revenue Product is a critical concept in determining the optimal quantity of a factor a firm should hire.

MRP = Marginal Physical Product (MPP) × Marginal Revenue (MR)

It measures the additional revenue a firm earns by employing one more unit of a variable factor. In competitive product markets, MR equals the price of the good.

4. Marginal Productivity Theory of Distribution (Wage)

The marginal productivity theory explains how the price of a factor (like wages) is determined in a competitive market.

• Equilibrium Condition: A profit-maximizing firm hires labour up to the point where the wage rate equals the Marginal Revenue Product (Wage = MRP).
• If Wage < MRP: The firm can increase profit by hiring more labour.
• If Wage > MRP: The firm should reduce its workforce to avoid losses on marginal units.

5. Concept of Rent and Ricardian Theory

In economics, rent refers specifically to the payment made for the use of land and other natural resources with a fixed supply.

Ricardian Theory of Rent

David Ricardo defined rent as "that portion of the produce of the earth which is paid to the landlord for the use of the original and indestructible powers of the soil".

• Extensive Cultivation: Rent arises because land differs in quality (fertility). Better quality land produces more output than "marginal" land for the same cost.
• Intensive Cultivation: Rent arises due to the law of diminishing returns; as more labour/capital is applied to the same land, the marginal product falls.
• No-Rent Land: The poorest quality land currently in use, which just covers its cost of production.

6. Modern Theory of Rent

The modern theory generalizes the concept of rent to any factor of production that is in inelastic supply.

Economic Rent = Actual Earnings - Transfer Earnings

• Transfer Earnings: The minimum payment required to keep a factor in its current use (opportunity cost).
• Economic Rent: The surplus earned by a factor over its transfer earnings.
• Supply Inelasticity: The more inelastic the supply of a factor, the higher the proportion of its earnings that constitutes economic rent.