Dear all,  
  
could anyone give me a hint whether the concept of a "production   
potential" was explicitly used before Okun (1962) ?  
  
Calculations of "inflationary gaps" were made, of course, following   
Keynes (1940) and older Wicksellian traditions, by Erik Lundberg and   
others in the late 1940s, and these calculations were based on   
full-employment output benchmarks. But in how far were attempts made to   
calculate the productive capacity of the capital stock, etc.?  
  
Grateful for any hints about pre-1962 concepts of "production   
potential", "output gaps" and the like,  
  
with best wishes,  
  
Michael Trautwein