◆ THE ECONOMY
Firms & Markets
How firms produce and compete — costs, market structures, labor, and the factors of production.
94 articles
FeaturedThe MR = MC Rule: How Firms Find the Profit-Maximizing Output
Firms maximize profit where marginal revenue equals marginal cost. Here's what that means, why it's always true, and how to apply it step by step.
Read more →Browse Firms & Markets
Deep Dives
◆ COMPETITION & MONOPOLY
Should You Shut Down or Exit? The Economics of When to Stop Producing
Losing money doesn't always mean stop. Economics splits idling temporarily from leaving for good — and the deciding number isn't the one most people watch.
◆ INTERNATIONAL TRADE
Trade Policy, Jobs, and the Political Economy of Protection
If economists agree trade grows the pie, why is protection so popular? Gains are spread thin, losses concentrated — and politics rewards the loud.
◆ THE FIRM & PRODUCTION
What Is a Firm? The Economic Unit That Turns Inputs Into Output
A firm is an organization that buys inputs, transforms them into output, and sells the result.
◆ THE FIRM & PRODUCTION
Average Cost vs. Marginal Cost: The Two Numbers That Drive Every Output Decision
Average cost tells you what each unit cost on average; marginal cost tells you what the next one will cost.
◆ THE FIRM & PRODUCTION
Why Cost Curves Are U-Shaped — and What That Shape Tells Every Business
The average cost curve dips, bottoms out, then rises — a U. The shape isn't a textbook quirk; it's the result of two real forces pulling in opposite…
◆ FACTOR MARKETS
Interest Rates and the Rental Price of Capital: How Firms Decide What to Build
The interest rate is the rental price of capital - the hurdle every investment must clear. Here is the net-present-value math firms use to decide what to build.
◆ COMPETITION & MONOPOLY
Deadweight Loss: The Hidden Cost of Monopoly That Never Shows Up on a Balance Sheet
Deadweight loss is value that simply vanishes when a monopoly restricts output — trades that would benefit everyone but never happen. Here is how to see it.
◆ FACTOR MARKETS
Capital as a Factor of Production: What It Is, How It's Priced, and Why It Matters
Capital is the produced means of production - tools, machines, buildings. Here is what counts as capital, how its rental price is set, and why it drives wages.
◆ THE FIRM & PRODUCTION
What Happens When a Factory Gets More Workers? The Production Function, Explained
A production function maps inputs to maximum output. It explains why the tenth worker adds less than the first, why factories hit walls, and how productivity…
Quick Answers
Minimum Wage: The Wage Floor and Its Effects
The minimum wage is a legally mandated floor on wages that employers must pay workers. It protects workers from poverty wages but may reduce employment in…
Read more →The Short Run vs. Long Run: The Most Important Time Distinction in Economics
The short run is the period when at least one input is fixed. The long run is when all inputs are variable.
Read more →Monopoly: When One Seller Controls the Market
A monopoly is a market with a single seller who faces no close substitutes and sets price above marginal cost.
Read more →Collusion and Cartels: When Competitors Act Like a Monopoly
Collusion occurs when competing firms coordinate on prices, output, or market allocation to raise profits above competitive levels.
Read more →Average Total Cost: The Cost Per Unit That Determines Profitability
Average total cost (ATC) is total cost divided by quantity produced — the cost per unit of output.
Read more →Marginal Revenue: The Revenue From One More Sale
Marginal revenue is the additional revenue earned from selling one more unit of output. Its relationship with price determines the firm's market power and its…
Read more →Perfect Competition: The Market Structure That Maximizes Efficiency
Perfect competition is a market structure with many sellers, identical products, free entry and exit, and full information.
Read more →Labor Unions: Collective Bargaining Power in the Wage-Setting Process
A labor union is a collective organization of workers that bargains with employers over wages, benefits, and working conditions.
Read more →Antitrust: The Policy Lever for Protecting Competition
Antitrust law prevents firms from monopolizing markets, fixing prices, or merging in ways that substantially reduce competition.
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