Good description of the situation. Basically it’s like a bank / confidence game - it works and has value until people lose confidence and then it’s worthless.
https://www.bloomberg.com/opinion/articles/2022-05-10/another-algorithmic-stablecoin-isn-t
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When we talked about Terra last month, I wrote:
On first principles this is insane. It relies on [Luna] always being worth something . If [Luna] trades at $0.01, you can print 10 million of them and buy 100,000 [Terra] and push the price up. But if [Luna] trades at $0.00, you can print infinity quadrillion of them and you’re still not gonna be able to push up the price of [Terra]. If [Luna] is worthless, it cannot be used to support the price of [Terra]. And because you just made it up , there is no particular reason for [Luna] to be worth anything, so there is no particular reason for [Terra] to be worth a dollar. If I made up [Luna] and [Terra] on my computer and said to you “I will give you the number 10 billion in this Excel spreadsheet if you give me 1 million U.S. dollars,” you would say no, and if I raised my offer to 400 quadrillion you would not change your mind.
Nonetheless! It works? The rough intuition here is that there is a lot of demand for stablecoins; there is particularly a lot of demand for Terra because Terraform Labs, the entity that created Luna and Terra, essentially pays 19.5% promotional interest on UST deposits. People want a stablecoin that is worth a dollar, so they are inclined to treat Terra as though it’s worth a dollar, which makes it worth a dollar. They buy lots of Luna to turn into Terra, which means that the price of Luna goes up, which means that there is plenty of valuable Luna to support the price of Terra, which means that Terra is robustly worth a dollar.
Ha, well, oops:
Rather than trading at $1, as designed, the TerraUSD coin, or UST, slipped over the weekend to around 99 cents. By Monday evening in New York, it had plunged to 60 cents, obliterating its previous low of 92 cents in May 2021. It clawed back losses on Tuesday and is fluctuating between around 90 cents and $1 – a sign of trouble. …