Let me quote Kenneth Arrow, who in an article in the Guardian, sums up the predicament rather succinctly when he says “There have been two developments in the economic theory of uncertainty in the last 60 years, which have had  2  BIS central bankers’ speeches  opposite implications for the radical changes in the financial system.
One has made explicit and understandable a long tradition that spreading risks among many bearers improves the functioning of the economy. The second is that there are large differences of information among market participants and that these differences are not well handled by market forces.