Everything you've learned this week — demand-pull, monetary expansion, wage-price spirals — describes inflation as a problem you manage. Central banks raise rates, cool demand, anchor expectations. It hurts, but it's recoverable. Hyperinflation is what happens when that management fails completely, and a country crosses a threshold where normal economics stops applying. The IMF's working definition is 50% inflation per month. Not per year. Per month. At that rate, prices double roughly every 51 days. But the real definition is simpler: hyperinflation is when people stop believing money will be worth anything tomorrow, and that belief makes itself true.

Here's the core mechanism, and it's brutal in its simplicity. Governments print money to cover debts they can't pay through taxes. Prices rise. People notice prices rising and spend money faster — why hold cash that's losing value? That velocity increase means more money chasing goods even without printing more. Prices rise faster. The government, now needing more money to pay its own bills at higher prices, prints more. Prices rise faster still. At some point the printing presses can't keep up with the inflation they caused. In Weimar Germany in 1923, the Reichsbank was printing notes with so many zeros that they ran out of ink colors to distinguish denominations. The machine eating itself.

The cruelest part of hyperinflation is who it destroys. You learned on Day 7 that regular inflation transfers wealth from savers to debtors. Hyperinflation does that, but at a scale that wipes out entire social classes. In Weimar Germany, the middle class — people who had spent decades accumulating savings, government bonds, life insurance — saw it all become worthless in months. The working class, paid in wages they spent immediately, fared better than the retired couple living off fixed savings. Debtors with mortgages paid them off with nearly worthless currency. The social fabric tore — exactly what that lunchtime wage handoff in November 1923 was a symptom of. Historians argue the hyperinflation of 1923 — and the resentment it created — was as important as the Great Depression in making ordinary Germans receptive to extremist politics a decade later. Inflation is an economic event. Hyperinflation is a civilizational one.

How do you stop it? The answer is always the same, and it's always brutal: you have to make people believe the money is worth something again, which means demonstrating that the government will stop printing it, which means finding another way to cover the deficit. Germany in 1923 did it with the Rentenmark — a new currency backed by land assets, issued in strictly limited quantity by a new bank with a mandate to refuse government borrowing requests. The key wasn't the backing. It was the credibility of the limit. Zimbabwe dollarized — replaced its own currency with someone else's, which works because you literally cannot print US dollars. Venezuela's recovery has been slower and messier, but the de facto dollarization of the economy did stabilize prices. In every case, the cure is the same thing the government refused to do at the start: stop. The longer they wait, the more it costs.