I am in full agreement, also, with Dr. Hayek's rebuttal of John Stuart Mill's well-known dictum that "there cannot, in short, be intrinsically a more insignificant thing, in the economy of society, than money," which he expresses admirably in the following passage from his last lecture: "it means also that the task of monetary theory is a much wider one than is commonly assumed; that its task is nothing less than to cover a second time the whole field which is treated by pure theory under the assumption of barter, and to investigate what changes in the conclusions of pure theory are made necessary by the introduction of indirect exchange. The first step towards a solution of this problem is to release monetary theory from the bonds which a too narrow conception of its task has created."
source
John Maynard Keynes, "The Pure Theory of Money : A Reply to Dr. Hayek" § IV, in Economica (November 1931), p. 395