The General Theory showed that the main determinant of the level of output and of employment at any point of time was the level of effective demand. It did so in an environment of uncertainty using analysis in historical time. Unfortunately, most of Keynes's insights were soon lost to the...

The paper considers Keynes's major contributions before "The General Theory", namely "A Tract on Monetary Reform" and "A Treatise on Money", and shows that they were close to the views which Friedman would later develop. However, "The General Theory of Employment, Interest and Money" represented...