Recently, F. Helmedag has made an attempt to revive the labour theory of value by trying to demonstrate the superiority of a theoretical model of the economy that uses values instead of prices of production in their traditional or in their modern form, that is Bortkiewicz- or Sraffa-prices. This...

This article will be a contribution to that discussion from a historical point of view. It is shown that the correct mathematical treatment of the transformation between values and prices can already be found in the works of the unknown German economist Wolfgang Mühlpfordt. His writings...