Yesterday, the Fed completed its regular meeting and announced that it would increase interest rates by 25 bps, or a quarter percentage point. This move was in line with expectations, and markets shrugged. Even at the press conference, when some awkward questions were asked (which Chair Powell ducked), markets bounced around but remained calm. But then something else happened. After Powell had gone to some trouble to assure people that their deposits were safe (without actually committing to anything), Treasury Secretary Janet Yellen was asked whether there were plans to dial up deposit insurance across the board. She said no, and then the market started to sell off.