"The belief that monetary instability--inflation and deflation--is the principal, or at least a principal, cause of other economic evils; the hope that sound monetary principles can be identified and, when identified, would greatly diminish uncertainty and risk; the focus on the job of the public sector being to provide the private economy with a stable measuring-rod and a stable environment--all these are core ideas of whatever we choose to call monetarism. Keynes believed these ideas very, very strongly in the mid-1920s. And his Tract on Monetary Reform is a review of economic theory and a look at the economic problems of post-WWI Europe through this set of monetarist spectacles."