Stablecoins aren't stable. So-called algorithmic stablecoins crash and burn when people behave in ways the algorithm didn't expect. And reserved stablecoins fall off their pegs - in either direction.A stablecoin that does not stay on its peg is unstable. Not one of the stablecoins currently in circulation lives up to its name.A stablecoin that can't hold its peg when everyone is piling into it is no more stable than one that can't hold its peg when everyone is selling it.