More than five years after the onset of the financial crisis, you might have thought economic policy makers would know what to do next. Well they don't. Or at the very least, there is nothing like the kind of consensus that prevailed before the financial crisis. The International Monetary Fund (IMF) has been hosting a conference on rethinking economic policy, organised by four experts in the area, including the IMF's own chief economist. One of the other organisers - the Nobel Prize winner George Akerlof of the University of California - had a vivid analogy for the state of uncertainty...