Forty Billion Dollars Stopped Existing in Four Days
TerraUSD promised it would always be worth exactly one dollar, and the algorithm built to defend that promise is what finished it off. In South Korea alone, close to 280,000 people watched it happen in their own accounts.
There is an old Skittles commercial still sitting on YouTube. Three teenagers eat candy on a rainbow. One of them asks what happens if the rainbow isn’t real — if it’s only imagination.
The rainbow opens. He falls. The others keep sitting. The line at the end is simple: believe the rainbow.
Hey, what if this rainbow doesn’t exist…
Funny. Mean. Exact. TBWA\Chiat\Day built the spot to sell candy, not epistemology, but the ending still gets cited on its own for the exact turn this post is about.
Cryptocurrency runs on the same rainbow. A coin is a shared story with a ledger attached — it buys a house, a pizza, a ticket out, for as long as enough people keep treating the story as money. Underneath the charts and the white papers is agreement. Withdraw the agreement and the number on the screen is still a number. It just stops holding weight.
In May 2022, a coin called TerraUSD was supposed to always be worth exactly a dollar — not backed by a vault of cash, but by a second coin, Luna, and an algorithm that would mint more Luna on demand to defend the peg whenever people sold. On a Saturday evening, enough people sold at once that the peg cracked, and the algorithm did exactly what it was built to do: mint more Luna to catch the fall, which only meant more Luna chasing the same shrinking pile of belief. Luna went from around eighty dollars to a fraction of a cent in four days. Something close to forty billion dollars stopped existing overnight — nobody stole it, nobody burned it, people just stopped agreeing it was there. In South Korea alone, close to 280,000 people felt that loss land in a personal account. The rescue mechanism had only ever worked because people trusted it; once that cracked, printing more of the coin just made it worthless faster.
That’s what counterfeiting really does, even without a fake bill in a basement: one crack teaches everyone nearby that any note might be hollow. Terra’s fall spooked people holding coins that had nothing to do with Terra — the wider crypto market kept sliding for weeks. Bank runs are the same physics in older clothes. Terra just ran the experiment without a teller window to slow anyone down.
The Skittles spot ends on a dare: keep believing, or don’t sit there. Crypto skips the dare — the market makes it in public, every few years. The rainbow wasn’t doing anything wrong on the way up or down. It only ever held as many people as agreed to sit.
The candy ad was selling sugar. The ledger was selling forty billion dollars’ worth of the right to keep sitting — until, one Saturday evening, not enough people still wanted to.