Sometimes ex-IMF officials shed the burden of having been associated with that institution and make a creative contribution to the public debate. More often they do not and continue to perpetuate the errors that underpin almost all of the IMF’s output. If there was ever an institution that has passed its use-by date it is the IMF. Today, ex-IMF Chief Economist Simon Johnson (now at MIT) claimed that the way to assess fiscal sustainability is “whether a country has the political will to raise taxes or cut spending when under pressure from the financial markets”. You can imagine what I thought of that criterion! Not much but it is too late in the year to get really flustered and I have been listening to some pretty good music this afternoon. So for all those readers who have written in saying “doesn’t Johnson have credibility” and “therefore is what he is saying sensible” I have three words – No and No.