AS COVID-19 spread across America, its fiscal and monetary tsars donned their masks, bumped elbows and presented a united front. Jerome Powell, the chairman of the Federal Reserve, slashed interest rates and bought Treasuries and mortgage debt. Steve Mnuchin, the treasury secretary, pushed through a stimulus package worth $2.2trn that increased the generosity of unemployment benefits and secured funding for the Fed to support firms and market participants in need. This partnership seemed to fracture on November 19th, when Mr Mnuchin wrote to Mr Powell to say that he would let several of the Fed's emergency lending schemes expire on December 31st. He asked for Treasury funds that had been allocated to the Fed, as capital to support these programmes, to be returned.
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