I recall with the help of my lecture notes to Paul Samuelson's course 
at MIT in 1965 that he stated "as long as there is a curve or hillock 
in any railroad line or highway in the world there will exist an 
investment project with a finite rate of return."  I have tried to 
determine if he ever said something like this in print.  Any comments 
or citations would be appreciated.



Richard Sutch
Distinguished Professor of Economics, Emeritus
University of California, Berkeley and Riverside

Visiting Scholar
University of California, Berkeley

Research Associate
National Bureau of Economic Research