Or consider Reinhart and Rogoff’s famous ‘90% debt threshold’, where their statistics purportedly showed that after a country reaches 90% of sovereign debt, its growth would stall. This was used by many politicians, including George Osborne, to justify austerity — until it was revealed to be based on ‘statistical errors’. Sure, R & R received a fair amount of flak for this, but they have been incredibly stubborn about t…