Curriculum Econ 101, Part 3: Firms, Costs & Market Structures
Econ 101, Part 3: Firms, Costs & Market Structures
Inside the business - how firms decide what to produce, why some markets stay competitive, and why others end up dominated by a few players.
- Fixed Costs, Variable Costs, and Marginal Cost Understanding how a firm's costs break down into fixed, variable, and marginal pieces is the foundation for nearly every decision a business makes. 📄 Read-aloud
- Economies of Scale Bigger production runs often mean lower average costs per unit - a pattern that shapes why some industries end up dominated by a few very large firms. 📄 Read-aloud
- Perfect Competition Perfect competition is the idealized market structure with many small firms, identical products, and easy entry - a useful benchmark even though it's rarely seen in pure form. 📄 Read-aloud
- Monopoly: When One Firm Is the Market A monopoly is the opposite extreme from perfect competition - a single firm with enough market power to restrict output and raise prices above the competitive level. 📄 Read-aloud
- Oligopoly and Strategic Behavior When a market is dominated by just a few large firms, each one's best move depends directly on what its rivals do - turning pricing into a genuine strategic game. 📄 Read-aloud
- Monopolistic Competition Most everyday markets - restaurants, coffee shops, clothing brands - sit in a middle ground with many competing firms selling products that are similar but not identical. 📄 Read-aloud
- Profit Maximization: Where Marginal Revenue Meets Marginal Cost Firms maximize profit not by producing as much as possible, but by producing exactly up to the point where the next unit's revenue no longer exceeds its cost. 📄 Read-aloud
- Barriers to Entry What keeps a market from drifting toward perfect competition is usually a barrier to entry - and those barriers come in several distinct forms worth telling apart. 📄 Read-aloud
- Antitrust and Competition Policy Governments actively police markets against anticompetitive behavior - antitrust policy is the toolkit aimed at keeping markets closer to the competitive end of the spectrum. 📄 Read-aloud
- Externalities: Costs and Benefits That Spill Over When a transaction affects people who weren't part of it, the market price stops reflecting the true cost or benefit to society - a mismatch called an externality. 📄 Read-aloud
- Price Discrimination: Charging Different Customers Different Prices Price discrimination is when a firm charges different buyers different prices for the same product, based on what each is willing to pay. 📄 Read-aloud
- The Short Run vs. the Long Run In economics, the short run and long run are defined not by the calendar but by which of a firm's inputs can still be changed. 📄 Read-aloud
- The Shutdown Decision: When Should a Firm Stop Producing? A firm losing money may still be better off operating in the short run, as long as its revenue covers its variable costs. 📄 Read-aloud
- Natural Monopoly and How It Is Regulated Why some industries are cheapest with a single supplier, and how governments regulate prices to protect consumers. 📄 Read-aloud
- Contestable Markets: When the Threat of Entry Matters Why even a market with one or two firms can behave competitively if new firms could easily enter, and what makes entry easy or hard. 📄 Read-aloud
- Vertical Integration: Making vs Buying Why some firms own multiple stages of production while others buy from suppliers, and how integration affects competition. 📄 Read-aloud
- Measuring Market Power How economists measure how concentrated an industry is and how much power firms have over prices, including market shares and the HHI. 📄 Read-aloud
- Economies of Scope Why producing several related products together can be cheaper than making them separately, and how this explains bundles, ecosystems and diversified firms. 📄 Read-aloud