The train of logic departs from a picture that economists of a hundred years ago would recognize as familiar – Robinson Crusoe allocating effort between fish and bananas, say – but barrels along at uncomfortable speed, picking up loads of subscripts on the way, into a fantasy land where the assumptions made about what people are able to know, to forecast and to calculate would leave them utterly bewildered and incredulous.
Axel Leijonhufvud “Episodes in a Century of Macroeconomics”