Chapter 8: Introduction to Perfect Competition

Vocabulary practice flashcards covering Chapter 8: Introduction to Perfect Competition, market models, revenue concepts, profit maximization, short-run and long-run adjustments, and market efficiency.

Pure Competition

A market structure characterized by a large number of independent buyers and sellers, homogeneous (standardized) products, free entry and exit, and perfect information.

Price Taker

A seller or participant in a competitive market that has no influence over the market price and must accept the prevailing market price as given.

Perfectly Elastic Demand

A horizontal demand curve facing an individual firm in pure competition, indicating the firm can sell any output quantity at the market price, but attempting to charge more causes all customers to leave.

Total Revenue ($TR$)

The total amount of money a firm collects from selling its output, calculated by multiplying the market price by the quantity sold ($TR = P \times Q$).

Average Revenue ($AR$)

The revenue earned per unit of output sold ($AR = \frac{TR}{Q}$); in a purely competitive market, average revenue is identical to the market price ($AR = P$).

Marginal Revenue ($MR$)

The additional revenue gained from selling one more unit of output; in pure competition, marginal revenue is constant and equal to the market price ($MR = P$).

Break-Even Point

An output level where total revenue equals total cost ($TR = TC$), allowing the firm to cover all implicit and explicit costs and earn a normal profit, but zero economic profit.

$MR = MC$ Approach

The profit-maximization rule stating that a competitive firm will maximize profit or minimize losses by producing up to the output level where marginal revenue equals marginal cost.

Total Economic Profit

The difference between total revenue and total cost, calculated graphically as the area of a rectangle with height $(P - ATC)$ and width equal to quantity ($Q$).

Normal Profit

The minimum level of profit required to keep a firm operating in a specific industry, achieved when economic profit is zero.

Loss Minimization Condition

A short-run situation where market price lies below average total cost ($ATC$) but above average variable cost ($P \ge AVC$), prompting the firm to keep producing where $MR = MC$ to cover variable costs and part of its fixed costs.

Shutdown Point

The price and output level where market price equals the minimum average variable cost ($P = \text{minimum } AVC$); if price drops below this level, the firm ceases operations in the short run to minimize losses.

Short-Run Supply Curve

The portion of a competitive firm's marginal cost ($MC$) curve that lies above its average variable cost ($AVC$) curve.

Short Run

A production timeframe during which at least one input or resource is fixed and cannot be varied.

Long Run

A production timeframe long enough for all resources to become variable and for firms to freely enter or exit the industry.

Long-Run Competitive Equilibrium

The market condition reached when entry and exit cease because firms earn only normal profits, satisfying the condition $P = MR = MC = \text{minimum } ATC$.

Constant-Cost Industry

An industry in which the expansion or contraction of output through firm entry or exit does not alter input prices or cost curves, resulting in a perfectly elastic (horizontal) long-run supply curve.

Increasing-Cost Industry

An industry in which expansion drives up the prices of specialized resources, causing the long-run average total cost ($LR\text{ }ATC$) to increase as output expands.

Decreasing-Cost Industry

An industry in which the long-run average total cost ($LR\text{ }ATC$) decreases as the industry expands, typically driven by external economies of scale.

Productive Efficiency

The production of goods and services at the lowest possible per-unit cost, attained in competitive equilibrium where $P = \text{minimum } ATC$.

Allocative Efficiency

The allocation of resources to produce the specific combination of goods and services most desired by society, attained when $P = MC$.

Creative Destruction

The economic process whereby continuous technological progress and innovation make outdated products, methods, and firms obsolete while creating new ones.

Monopoly

A market model dominated by a single seller offering a unique product with no close substitutes and protected by high entry barriers.

Monopolistic Competition

A market structure characterized by many competing sellers offering differentiated products with relatively low barriers to entry and some pricing control.

Oligopoly

A market model dominated by a few large sellers with mutually interdependent decision-making, producing standardized or differentiated goods behind high barriers to entry.