Thanks for quoting this preface to the French edition - Keynes himself clearly was making his best to advocate his "revolution". May be we could remind us that in Keynes' (and Joan Robinson's) line of fire stood the "Treasury view." Discussions about "laissez faire", unbalanced budgets, gold standard, etc. were interwoven. I remember it was a headache for me when I was translating Joan Robinson (or Mark Blaug's chapter on Keynes) to translate this expression. I found useful "The "Treasury View" on Public Works and Employment in the Interwar Period" G. C. Peden - The Economic History Review, New Series, Vol. 37, No. 2. (May, 1984), pp. 167-181. Peden clearly did not support Keynes but he portrayed the different positions in a way which can perhaps explain the kind of generalization made by Krugman. Alain Alcouffe