From the introduction:

This essay goes beyond blaming economics for having failed to predict the crises and asks; what can economists know and what can we expect from economic models? In the first part of the essay I shortly summarize 90 years of economic thought on uncertainty and the limits of economic knowledge, in order to show the specifics of the problem of uncertainty in economics. Afterwards I examine a new economic approach, called Imperfect Knowledge Economics (IKE), that claims to provide "[...] the boundary to what modern macroeconomics and finance can deliver." By critically reviewing IKE in the third part of the essay I will explore and mark the boundaries of IKE and economic knowledge in general.