To support Luca's comments, I would point out that the break in Knight's
thought after RUP extended to methodology: he rejected the "successive
approximation" approach from theory to reality that he had adopted in RUP,
and moved to a view of a radical disjunction between theory and reality, as
expressed in "Statics and Dynamics" (published in German in 1930 and in
English in 1935). The latter is heavily influenced by Max Weber's ideal type
method.

His new approach to behaviorism is well-documented in a string of essays in
the 1920s. The one that is not found in The Ethics of Competition is perhaps
the most important in terms of his treatment of behaviorism: "Fact and
Metaphysics in Economic Psychology." AER 15 (June 1925): 247-66.

Harro: For more on Bergson and Knight, see John Wesley McKinney's 1967
dissertation "A Critique of Frank H. Knight's Economic Philosophy," Columbia
University.

Ross Emmett