Consumer and Producer Theory Lecture Notes

Vocabulary practice flashcards based on lecture notes on Consumer Theory, Producer Theory, Cost Functions, Monopoly, and Perfect Competition.

Rational Consumer Theory

The theory that people's consumer choices are intentional and limited by budget constraints.

Pareto (1891)

Civil engineer who established that while minds cannot be measured, choices can be measured to reveal predictable patterns.

Samuelson (1938)

Economist who posited that choice reveals preference and defined rationality as consistent preferences.

Budget Line

A line indicating maximal consumption where expenditure equals available funds, expressed generally as $P_1 Q_1 + P_2 Q_2 = Y$, with a slope equal to the negative relative price.

Indifference Curve

A curve showing combinations of goods that the consumer considers to be equally as good, dividing preferred from not preferred bundles.

Marginal Rate of Substitution (MRS)

The rate at which a person will give up one good for another while remaining indifferent; it relates to the slope of the indifference curve and measures marginal benefit.

Diminishing Marginal Rate of Substitution

The property causing typical indifference curves to get flatter as marginal benefits decrease and preference for variety is exhibited.

Perfect Complements

Goods where having less of one unit means consuming less of another, resulting in an undefined $MRS$.

Perfect Substitutes

Goods where having less of one unit means substituting exactly the same amount of another, resulting in a constant $MRS$.

Optimal Consumption Condition

The consumption point where the slope of the indifference curve equals the slope of the budget line, represented by $MRS = \frac{P_1}{P_2}$.

Firm

An institution that uses factors of production to produce and sell goods and services.

Accounting Profit

Total revenue minus accounting cost, where revenue is calculated as $\text{Price} \times \text{Quantity}$.

Accounting Cost

Money spent buying factors of production in the market, including employer wages, materials and energy costs, rental payments, interest on loans, and accounting depreciation.

Economic Profit

Revenue minus economic cost, which firms make optimal choices to maximize.

Economic Cost

The opportunity cost of production, which includes accounting cost, the opportunity cost of resources owned by the firm and its owners, economic depreciation of capital, and foregone interest rates.

Short Run

A time horizon where at least one factor of production is fixed.

Long Run

A time horizon where all factors of production are flexible.

Marginal Product

The output that forms from adding one more unit of input.

Average Product

Maximum output divided by input quantity; it is maximized when average product equals marginal product.

Law of Diminishing Returns

The economic principle stating that as a firm uses more of a factor of production, its marginal product eventually diminishes.

Total Fixed Cost (TFC)

The cost of fixed factors of production, which does not depend on the quantity supplied.

Total Variable Cost (TVC)

The cost of variable factors of production, which depends directly on the quantity supplied.

Marginal Cost (MC)

The increase in total economic cost from producing one additional unit of output, calculated as $MC = \frac{\Delta \text{Cost}}{\Delta \text{Output}}$.

Economies of Scale

A production condition where scaling up production lowers long-run average cost ($LAC$).

Diseconomies of Scale

A production condition where scaling up production increases long-run average cost ($LAC$).

Minimum Efficient Scale

The smallest output level that minimizes long-run average cost ($LAC$).

Monopoly

A market operated by a single firm, called the monopolist.

Marginal Revenue (MR)

The change in total revenue from a marginal increase in quantity sold, defined by $MR = \frac{\Delta TR}{\Delta Q}$.

Profit-Maximizing Rule

The condition where a firm maximizes economic profit by setting marginal cost equal to marginal revenue ($MC = MR$).

Producer Surplus

Total revenue minus total variable cost ($\text{Revenue} - TVC$), visually represented as the area under price and above the marginal cost ($MC$) curve.

Sunk-Cost Fallacy

The economic behavioral fallacy summarized as failing to let bygones be bygones when making decisions.

Price Discrimination

When a firm charges different prices for different units of a product, and this price difference is not driven by cost differences.

Perfect Competition

A market structure where all firms act as price takers and face a perfectly elastic residual demand curve.

Competitive Firm Optimal Output

The production quantity where a price-taking competitive firm sets marginal cost equal to price ($MC = P$).

Temporary Shutdown Rule

The short-run decision rule stating that production is only worth continuing if price is greater than minimum average variable cost ($P > \min(AVC)$).

Competitive Firm Supply Function

The individual supply function of a competitive firm, corresponding to its marginal cost ($MC$) curve above the average variable cost ($AVC$) curve.