AMENDING a famous metaphor, Janet Yellen once said that the Federal Reserve would “keep refilling the punch bowl until the guests have all arrived”. This week investors began to wonder if Jerome Powell, who will shortly succeed Ms Yellen at the top of the Fed, might at last deem the party full. On January 29th the ten-year Treasury yield reached 2.7%, the highest since early 2014. The prospect of tighter money caused stockmarkets to sneeze. On January 30th the S&P 500 fell by 1.1%, its biggest decline since August, before recovering a tiny bit the next day. With unemployment low and tax cuts pending, investors are wondering whether inflation and interest rates might soon surge.