The Firm & Production
Production functions, the short and long run, cost curves, and economies of scale.
27 articles
FeaturedShort Run vs. Long Run: Why the Same Firm Behaves Differently Over Time
In the short run a firm is stuck with its plant and adjusts by hiring; in the long run everything is variable.
Read more →Deep Dives
9 articles
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.
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…
Marginal Product of Labor: The Numbers Behind Every Hiring Decision
Marginal product of labor is the extra output from one more worker. Here is the math that tells a firm exactly when to hire, when to stop, and what a worker…
Returns to Scale: What Happens When You Double Everything in a Production Process
Double every input — does output double, more than double, or less? Returns to scale answers that, and it explains why some industries have giants and others…
Inside a Firm's Costs: Fixed, Variable, and Total — and Why the Difference Matters
Fixed costs don't move with output; variable costs do. Splitting a firm's total cost into those two pieces is the first thing that explains why prices,…
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.
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…
What Happens When a Company Doubles in Size? Economies and Diseconomies of Scale
Growing bigger can make every unit cheaper — until it doesn't. Economies of scale pull costs down as a firm expands; diseconomies push them back up.
Sunk Costs Don't Matter to Your Next Decision. Here Is Why They Feel Like They Do.
A sunk cost is money already spent that you can't get back. Rationally it should never affect your next choice — yet it constantly does.
Quick Answers
17 termsThe Law of Diminishing Returns: Why Adding More Eventually Produces Less
The law of diminishing returns states that adding more of one input to a fixed set of other inputs will eventually yield smaller and smaller increases in…
Read more →Sunk Cost: Why Past Spending Shouldn't Drive Future Decisions
A sunk cost is a cost already incurred that cannot be recovered. Rational decision-making ignores sunk costs — only future costs and benefits are relevant to…
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…
↔ Also in Competition & MonopolyRead more →Marginal and Average Product: How Much Does One More Worker Add?
Marginal product is the additional output from one more unit of an input. Average product is output per unit of input.
Read more →Economies of Scale: Why Getting Bigger Sometimes Means Getting Cheaper
Economies of scale occur when long-run average cost falls as output increases. They are the economic engine of industrial concentration — and when they're…
Read more →Explicit vs. Implicit Costs: The Full Picture of What a Business Really Costs
Explicit costs are the cash payments a firm makes; implicit costs are the opportunity costs of resources the firm owns.
Read more →Marginal Revenue Product: What One More Worker Is Actually Worth
The marginal revenue product of labor is the additional revenue generated by hiring one more worker.
↔ Also in Labor EconomicsRead more →Factors of Production: The Four Inputs Behind Everything Made
Factors of production are the inputs used to create goods and services: land, labor, capital, and entrepreneurship.
Read more →Economic Profit: The Real Test of Whether a Business Is Creating Value
Economic profit subtracts all costs — including implicit opportunity costs — from revenue. Zero economic profit is not failure; it means the business is…
Read more →Returns to Scale: What Happens to Output When You Double Everything
Returns to scale describe how output responds when all inputs are increased proportionally.
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 Cost: The Only Cost That Matters for the Next Decision
Marginal cost is the additional cost of producing one more unit of output. It is the cost variable that drives every output, pricing, and hiring decision at…
Read more →Long-Run Equilibrium: Where Competition Eventually Takes Every Market
Long-run equilibrium is the state a competitive market reaches after all entry and exit adjustments are complete.
↔ Also in Competition & MonopolyRead 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 →The Profit-Maximization Rule: Why Every Firm Targets MR = MC
The profit-maximization rule states that firms maximize profit by producing where marginal revenue equals marginal cost.
↔ Also in Competition & MonopolyRead more →The Production Function: What Comes Out When You Put Inputs In
A production function describes the relationship between the quantities of inputs a firm uses and the maximum output it can produce.
Read more →Fixed vs. Variable Costs: How Cost Structure Shapes Business Decisions
Fixed costs don't change with output; variable costs do. The ratio between them determines a firm's operating leverage, its break-even point, and how it…
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