Microeconomics: Core Concepts and Market Structures – Final Review Notes

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Basic Supply & Demand

Understanding Supply and Demand

The concepts of supply and demand form the foundation of microeconomic analysis. The interaction between consumers and producers determines the market price and quantity of goods exchanged.

Demand Curve (D): Illustrates the quantity of a good that consumers are willing to purchase at various prices.
Supply Curve (S): Shows the quantity of a good that producers are willing to sell at different prices.
Equilibrium: The point where the quantity demanded (Qd) equals the quantity supplied (Qs), determining the equilibrium price (Pe) and equilibrium quantity (Qe).

Key Equation:

At equilibrium, the market clears, and there is neither excess supply nor excess demand.

Elasticity

Elasticity measures the responsiveness of quantity demanded or supplied to changes in price or other factors.

Price Elasticity of Demand (PED): The percentage change in quantity demanded divided by the percentage change in price.

Formula:

Elastic Demand (|PED| > 1): Quantity demanded is very responsive to price changes.
Inelastic Demand (|PED| < 1): Quantity demanded is not very responsive to price changes.
Unit Elastic (|PED| = 1): Proportional response of quantity demanded to price changes.

Revenue Implications:

Elastic Good: Total revenue increases when price decreases.
Inelastic Good: Total revenue decreases when price decreases.

Consumer Theory

Utility Maximization and Budget Constraint

Consumers aim to maximize their satisfaction (utility) given their income and the prices of goods.

Utility: A measure of satisfaction or happiness derived from consuming goods and services.
Marginal Utility (MUx): The additional utility gained from consuming one more unit of good x.
Budget Constraint: The combination of goods a consumer can afford, given their income and the prices of goods.

Budget Line Equation:

where and are the prices of goods X and Y, and is income.

Optimal Choice: Occurs where the consumer's marginal rate of substitution (MRS) equals the price ratio, or where the marginal utility per dollar is equalized across goods.

Condition for Optimal Consumption:

Production

Production Function and Inputs

The production function describes the maximum output that can be produced with given inputs.

Short Run: At least one input (typically capital, K) is fixed, while others (like labor, L) are variable.
Total Product (TP): Total output produced with given inputs.
Average Product (AP): Output per unit of input.
Marginal Product (MP): Additional output from using one more unit of input.

Marginal Product of Labor (MPL):

Stages of Production

Stage	Description
I	Increasing returns
II	Diminishing returns
III	Negative returns

Market Structures (Quick Recap)

Types of Market Structures

Market structure refers to the characteristics and organization of a market, primarily the number of firms and the nature of competition.

Market Structure	Key Features
Perfect Competition	Many firms, price takers, in the long run
Monopoly	One firm, , produces where
Monopolistic Competition	Many firms, differentiated products, some market power
Oligopoly	Few firms, interdependent behavior (e.g., collusion, game theory)

Key Takeaway

People respond to incentives: Changes in prices, costs, or benefits influence the decisions of consumers and producers.

Additional info: Some formulas and definitions were expanded for clarity and completeness. The stages of production and market structure tables were reconstructed for academic accuracy.