Price Signals & the Calculation Problem

This interactive demonstrates why prices matter for coordinating an economy, in three acts. Act 1 simulates a six-good market economy (wheat, steel, fuel, machines, bread, shoes, with realistic supply chains). In month 3 a drought halves wheat capacity. With floating prices, the wheat price roughly doubles within a month; bread gets more expensive; households buy somewhat less bread (economizing without being told about any drought); and high prices draw producers back into wheat, so supply largely recovers within the year. Total unmet demand stays small.

Act 2 replays the identical economy and drought, but prices are frozen and you set production quotas by hand - with reports that arrive two months late, as they did in real planned economies. Because no price signals the shortage, and every correction diverts inputs from other goods, users typically end the year with several times the market's unmet demand plus warehouses of surplus goods. Act 3 explains the two underlying arguments: Mises's calculation problem (without prices there is no common unit to compare production alternatives) and Hayek's knowledge problem (the needed information is dispersed and never available to one mind in time), with honest historical context on where planning did and didn't work.