Governments are throwing trillions of dollars at rescuing their economies from the Covid-19 pandemic, but how can they afford it all, and whatever happened to austerity?How much debt are governments running up? How much will markets be willing to lend? Can central banks help with the financing without risking their independence or undermining confidence in the currency? Who will ultimately repay the debts? And having made such huge interventions to contain the virus, will governments continue to play a much bigger role in running the economy in the future?Manuela Saragosa follows the money with the help of the BBC's global trade correspondent Dharshini David, and economist and former UK Treasury official Richard Hughes of the Resolution Foundation think tank.(Picture: Benjamin Franklin on the 100 dollar bill wears a face mask against Covid-19 infection; Credit: Diy13/Getty Images)