The PPF: The Menu of an Economy

One graph that shows everything you can make, and what each choice costs.

4 min readInteractiveQuick check inside

The big idea

The production possibilities frontier (PPF) maps every combination you can make with limited resources. On the curve you’re efficient, inside it you’re wasting resources, and outside it is impossible for now.

Picture one cherry tree, one pear tree and one hour to harvest. Spend the whole hour on cherries and you pick 300. Spend it all on pears and you get 100. Every split of that hour gives a different mix, and if you plot them all you get the production possibilities frontier.

Notice the curve bows outward. You grab the low-hanging fruit first, so each extra cherry costs more and more pears. Going from 200 to 290 cherries costs you 50 pears, while going from 100 to 200 only cost 25. That’s increasing opportunity cost, and it’s why most real PPFs are curved.

A point inside the curve means wasted potential: lazy pickers, broken machines, unemployed workers. A point outside the curve is impossible with today’s tools. To get there you need growth. Shake the trees instead of hand-picking them and the whole frontier shifts outward.

One hour, two trees: build the PPF

Try it
🍒 CherriesPears 🍐01002003004000255075100125Lazy picking: wasted time⭐250 🍒 + 80 🍐 ?

Spot it in the wild

CountriesA nation choosing between tanks and hospitals is picking a point on its PPF. A recession with high unemployment puts it inside the curve.
AthletesTrain for strength and you give up some endurance. Better coaching shifts an athlete’s whole curve out.
YouYour 24 hours a day is a personal PPF. Study versus sleep versus friends: pick your point.

Quick check

Tap an answer.

A factory has 20% of its machines broken. Where is it on its PPF?

Idle or broken resources mean it’s producing less than it could, so it’s at an inefficient interior point.

What shifts the entire PPF outward?

Moving along the curve just changes the mix. New tech, more workers or more capital let you make more of both.