Lionel W. McKenzie of the University of Rochester, a significant
player in Knowledge and the Wealth of Nations and careful reader
of the book, has along sent ”a little paper” untangling the
highly-compressed description of turnpike theorems that appears
in connection with the series of conferences on growth theory
that occurred in the early 1960s. [P. 156: "Exciting new
theorems about the existence of "turnpikes" were being proved
and disproved (routes by which economies might swiftly move to
higher levels of industrial development through forced
investment in heavy industy)." ] He writes: I was surprised when
I worked on the notion of a turnpike in economics that it was
not already explored by mathematicians as a part of the calculus
of variations. However I have found many topics in the
mathematics of economics which were not dealt with in the
mathematical literature not because they were difficult but
because they were too special for general mathematical interest.
However I have now noticed that some math