So why is Riga persisting with peg crucifixion? The central bank has burned a tenth of its reserves in a fortnight. Overnight rates have topped 200pc. Why go on? No doubt devaluation would be a shock for middle class Latvians with euro and Swiss franc mortgages, but they face punishment either way – slowly by debt deflation, fast by devaluation. Swedish banks with $75bn of exposure to the Baltics have already thrown in the towel, accepting that it might be better for all to lance the boil.