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