This recent article by Krugman is short and brilliant. First, though, the background.
As Bill Mitchell, me and numerous others have pointed out for a long time, some of the literature emanating from the IMF (and the OECD) is nonsense. But as Krugman points out, IMF employees are not totally stupid. So why the nonsense?
According to Krugman, the explanation is that the IMF has to keep in sweet with rich and/or powerful idiots: the real source of nonsensical ideas.
I’m sure there's plenty of truth there. I.e. if Stalin, Hitler, or the Taliban ruled the world, the IMF would have to make complimentary remarks about, respectively, Gulag Archipeligos, gas chambers, and stopping women learning to read and write.
Having said that, my hunch is that "it's a bit of both": i.e. there are some genuine incompetents in the IMF, while competent IMF staff know they cannot say exactly what they think.