Why Money Loses Value: A Short History of Inflation

The one-line idea: inflation isn’t things getting more expensive. It’s money getting weaker. A price is just a ratio — how much money it takes to buy one thing. If there’s suddenly a lot more money floating around chasing the same amount of stuff, each dollar buys less of it. The stuff didn’t change. The money did.

Here’s that idea followed through one small island’s economy, start to finish. Population never changes — it stays exactly 10 people the whole story — so the only two things moving are money supply and how many fish get caught. Every price below is just money supply ÷ fish caught.

The island

Ten people live on a small island. Between them, they have $100 total, and every year they catch and sell 100 fish. A fish costs $1.

One year, someone builds a second boat, and the island catches 200 fish instead of 100 — real growth, more actual stuff getting made. If the island’s money supply also grows to $200 that year, a fish still costs $1. Nothing broke. There’s more fish and more money, growing together, so prices hold steady. This is the healthy version: money supply is supposed to grow, just no faster than what the economy actually produces.

Now picture the unhealthy version instead: someone finds a treasure chest and hands out an extra $100 — $200 total — but the island still only catches 100 fish, same as before. Nothing about the fish changed. But now there’s twice as much money chasing the same 100 fish, so people start paying $2 for a fish instead of $1. That’s inflation, in miniature — the fish are just as good as before, the money is worth half as much.

Keep both versions in mind. Everything below is one of those two things happening, again and again, as this island grows up.

One honest note: real economies have plenty of other moving parts. This story deliberately simplifies to the one cause that matters most for everything that follows.

Act 1: scarcity as inflation control

Why start here? The earliest fix to the treasure-chest problem was simple: tie money to something nobody can just create more of. If nobody can make more of it on demand, nobody can flood the island with it — the discipline happens automatically, with no council needed to decide anything.

The island’s money is paper notes. Each note can be swapped for one shell. Shells are hard to find — they wash up on the beach only once in a while. That means there can only ever be as much money on the island as there are shells to back it up.

Some years a lot of shells wash up. Some years almost none do, no matter how the fishing is going that year. Generation after generation, the island keeps getting a little more fish and a little more money at roughly the same pace, and a fish keeps costing close to $1. Nobody is steering this on purpose. It just tends to work out that way.

Act 2: the shells stop backing the money

One year, the island’s council removes the shell-backing rule. The notes look exactly the same as always — nothing about the paper itself changes. But they’re no longer a promise you can trade in for a shell; they’re worth something now purely because everyone agrees to trust them. The money supply doesn’t change that day, it’s still $150. What changes is that the council is no longer limited by how many shells exist — it can create more notes whenever it wants, starting now. Nothing bad happens right away. But the safety rail is gone.

Act 3: a storm, and money printed through it

A bad storm wrecks half the island’s boats. The fish catch drops hard — a real hit to what the island can actually produce. Instead of tightening up and waiting it out, the council prints more notes — pushing money supply from $150 to $250 — to keep everyone comfortable while the boats get rebuilt. Money supply and fish supply pull apart hard, and prices spike badly.

One council elder finally forces a fix: make it very expensive to borrow notes to rebuild a boat. When borrowing is expensive, fewer new notes get created and handed out — so there’s less extra money chasing the same fish, and prices stop climbing. Fewer boats get built for a while, times get harder, but the flood of new money slows to a stop, and prices settle back down.

Act 4: it happens again

Decades later, another storm hits the island. Boats are damaged again, the fish catch drops. This time the council prints another 120 notes and hands them out as emergency relief, so nobody goes hungry while the boats are rebuilt — money supply jumps from $150 to $270. More money, less fish — again — and prices jump again. The council raises the cost of borrowing fast, the same playbook as before, to cool it back down.

Storms like this aren’t a one-time thing for this island — they keep happening, generation after generation. Each time, the fix looks the same: stop the printing, make borrowing expensive, wait it out.

This is essentially what happened in many real economies

None of this happened on an actual island. But something extremely close to it happened for real, more than once.

Commodity money: the gold standard

For a long stretch, a lot of countries — including the U.S. — tied their money to gold instead of shells. A dollar could be traded in for a fixed amount of gold, so nobody could print more dollars than the gold in the vault allowed. Just like the island’s shells, how much gold miners happened to dig up had nothing to do with how much the economy was actually producing — which is both why the system worked for so long, and why it eventually strained.

Fiat money: 1971

In 1971, the U.S. president at the time, Richard Nixon, ended the gold standard for good. The dollar stopped being backed by gold or anything physical — it was worth something purely because the government said so and people trusted it. Economists have a name for that: fiat money (fiat just means “by decree”). After that, controlling inflation depended on policy instead of gold.

The 1970s: the first real stress test

Oil prices spiked hard after supply shocks in the Middle East, and instead of tightening up, the U.S. kept money loose — borrowing stayed cheap, spending stayed high. Prices rose so fast that by 1980, inflation was running near 14% a year — a dollar in 1980 bought less than half of what it bought ten years earlier. The person who broke it was Paul Volcker, head of America’s central bank, the Federal Reserve, starting in 1979. His fix was the same one the island’s elder used: make borrowing very expensive. In the real world, the cost of borrowing money is called the interest rate — Volcker pushed it way up, over 19% at one point. Borrowing got expensive, the economy slowed hard, and it caused a painful recession (a stretch where the economy shrinks and jobs get harder to find) — but it killed the inflation.

Post-COVID inflation: 2021–2023

It happened again. After COVID hit in 2020, governments pumped huge amounts of money into their economies — stimulus checks, extra unemployment benefits, cheap loans — while factories and shipping were a mess, producing and moving less than normal. More money, less stuff — the same combination as every island storm. U.S. inflation hit about 9% in mid-2022, the highest in over 40 years. The Federal Reserve answered with Volcker’s playbook again — raising interest rates fast, from near 0% to over 5% in about a year and a half — to cool things back down.

The storms change. The response is usually the same.

Why this matters for you

Anyone on the island who kept their notes buried under their hut instead of putting them to work — lending them out to help build the next boat, say — ends up able to buy fewer fish every single year, even though the pile of notes never got smaller.

It’s the same for you. Keep money sitting in cash, or in a bank account paying close to 0%, and it’s quietly losing buying power every year, even though the number on the balance never drops.

The notes under the hut never disappeared. What they could buy did. A bank balance can do the exact same thing, just more quietly.