The Basic Economic Problem (Unit 1 Topic 1)

The Production Possibilities Curve: the Fundamentals

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Every economy faces scarcity: resources are limited, but wants are not. The production possibilities curve shows the maximum combinations of two goods an economy can produce when all its resources are fully and efficiently used. Here the choice is between capital goods and consumer goods.

The curve marks the frontier of what's possible, and where you sit relative to it matters.

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On the curve — production is efficient. Every resource is employed, and the only way to get more of one good is to give up some of the other. That sacrifice is opportunity cost.

Inside the curve — resources are idle. Unemployed workers, machinery standing still, land unfarmed. This is what a recession looks like, and it's the one position where an economy can produce more of both goods at no opportunity cost, simply by putting existing resources back to work.

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Outside the curve — currently unattainable. No reallocation reaches it. Only economic growth can.

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Increasing opportunity cost

The curve bows outward rather than running straight because resources aren't equally suited to both uses. The first workers moved into capital goods are those best suited to it; keep going and you must shift people who were far better at making consumer goods. Each extra unit costs more than the last. Read this off the diagram as the gradient: shallow near the consumer-goods axis, steep near the capital-goods axis.

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Using the interactive

The output-mix slider moves the gold dot along the frontier — watch the opportunity cost figure climb as you shift towards capital goods.

Drag the blue curve outwards to model economic growth: more resources, a larger workforce, or better technology. Every point moves proportionately, so more of both goods becomes possible, and the original frontier stays visible as a dashed ghost. Drag it inward for a loss of capacity.

Drag the red dot anywhere to place current output inside, on, or outside the curve.