Theory of the Firm - A Microeconomics Course for Business

Explore cost theory by distinguishing short-run and long-run costs, and analyzing total, average, and marginal product within the framework of explicit and implicit economic costs.

Compare explicit costs, such as wages and materials, with implicit costs—the opportunity costs of using resources or entrepreneurship—through a factory example.

Construct a short-run cost diagram for the theory of the firm by plotting total, fixed, variable, average fixed, average variable, average total, and marginal costs to analyze revenue and profit.

Explore long-run costs by comparing the long-run average cost curve with the short-run curve, and see how planning, fixed inputs, and economies of scale shape production.

Explore revenue theory by defining total revenue, marginal revenue, and average revenue, and explain how profit equals revenue minus costs, including normal profits, abnormal profits, and losses.

Explore total revenue, average revenue, and marginal revenue: total revenue equals price times quantity; average revenue equals revenue per unit; marginal revenue is the revenue from selling one more unit.

Explore revenue curves for price maker market structures, monopoly, monopolistic competition, and oligopoly, covering demand equals average revenue, marginal revenue behavior, and the revenue-maximizing point where elasticity equals one.

Learn how costs and revenue shape profit, distinguish normal profit from abnormal profits, and preview the profit theory unit in the theory of the firm.

Analyze the basics of profit theory by defining economic profit as total revenue minus economic costs and distinguishing abnormal (supernormal), normal, and negative profit, including implicit costs.

The shutdown price is where price equals average variable costs, signaling short-run production should stop if revenue cannot cover variable costs. Otherwise, firms keep operating despite losses.

Learn how to identify the shutdown price on a diagram, where price equals the lowest avc in the short run and mc intersects avc, signaling whether to stay open.

Explore motives beyond profit, including revenue maximization, growth maximization, and satisfying, plus corporate social responsibility, with real-world examples from startups and Patagonia.

Examine perfect competition as a price taker market where many firms sell a homogeneous product with perfect information and minimal barriers, earning normal profits in commodity and agricultural markets.

In perfect competition, price takers maximize profit where marginal cost equals marginal revenue; the lecture uses the cost and revenue diagram to identify output and abnormal, normal, or loss profits.

Learn to depict abnormal profit in perfect competition by drawing revenue curves, marginal cost, and marginal revenue to locate the profit-maximizing output, while noting profits normalize in the long run.

Explore normal profit in perfect competition through revenue and cost diagrams, showing price, AR, MR, and MC intersecting with AC at the profit-maximizing output, signaling long-run equilibrium.

Isolate allocative efficiency in the short run under perfect competition and contrast it with monopoly, monopolistic competition, and oligopoly, using MR, AR, and MC.

Examine the long-run equilibrium in perfect competition, where normal profit prevails, and price equals average revenue and marginal revenue, with AC equal to MC and equal to price.

Explore how productive and allocative efficiency arise in the long run under perfect competition, with the normal profit diagram showing where MC, AC, and AR meet.

Celebrate mastering the most important market structure, perfect competition, and learn to apply the cost revenue profit model to compare productive and allocative efficiency across market structures.

Identify sources of monopolistic power, including economies of scale, natural monopoly, legal barriers like patents, and brand loyalty, which raise barriers to entry and enable anti-competitive behavior.

Analyze how to illustrate abnormal profit, normal profit, and losses in monopoly using a base profit diagram with demand, average revenue, marginal revenue, marginal cost, and the profit-maximizing output.

Explore how monopolies maximize revenue by producing where marginal revenue hits zero. Compare the revenue-maximizing output to the profit-maximizing level, using the demand and marginal revenue curves.

This monopoly lecture analyzes productive and allocative efficiency using demand, average revenue, and marginal revenue curves, shows profit maximization at MC=MR, and compares MC=AC and MC=AR points.

Compare perfect competition with monopoly to show how price, output, and efficiency differ, and explain economies of scale and anti-competitive drawbacks.

Discover the monopoly market structure, its price-making power, and how supply and demand drive outcomes, with a note on government stewardship when firms become too large.

Examine monopolistic competition and its key traits—many firms, price making, product differentiation, and no entry barriers—through examples like sushi and clothing markets.

Examine equilibrium in price-makers monopolistic competition by aligning demand (average revenue), marginal revenue, and marginal cost to find profit-maximizing output, while average cost meets average revenue to show normal profits.

Examine productive and allocative efficiency in monopolistic competition, compare to perfect competition, and identify profit-maximizing output (MC = MR) versus efficient outputs (MCE = AC and MC = demand).

Compare monopolistic competition with perfect competition to show that in perfect competition profit-maximizing output coincides with productive and allocative efficiency, while MCI fails to reach both.

Draw the base oligopoly profit diagram with price, cost, and output, then plot the demand and marginal revenue curves against the marginal cost to identify abnormal, normal, or loss profits.

Explore game theory in non collusive oligopolies, using the prisoner's dilemma to show interdependence and how firms choose high or low prices to maximize profits and deter collusion.

Explore the kinked demand curve in non collusive oligopolies, showing why prices stay near the current market price to avoid price wars, with marginal revenue and cost guiding output.

Explore non-price competition in oligopolies, where firms rival through branding, advertising, packaging, loyalty programs, and service. Real-world examples include Nike vs Adidas, Procter and Gamble, and airlines' frequent flyer programs.

Conclude the theory of the firm by mastering the four market structures—perfect competition, monopoly, monopolistic competition, and oligopoly—and apply cost, revenue, and profit to strategic business decisions.

Price discrimination exists when a producer charges different prices to different consumers for the same product, requiring price setting ability, varying demand elasticities, and separation of customers.