"The General Theory is a badly written book, poorly organised… It is not well suited for classroom use. It is arrogant, bad-tempered, polemical, and not overly-generous in its acknowledgements… In it the Keynesian system stands out indistinctly, as if the author were hardly aware of its existence or cognisant of its proprieties… When it is finally mastered, We find its analysis to be obvious and at the same time new. In short, it is a work of genius."

- (Samuelson, 1946, p.190)