This paper is a rejoinder to Kliman's (2008-9) reply to a paper published in the >i>Journal of Post Keynesian Economics>/i> by Díaz and Osuna (2005-6). We show that Kliman's reasoning about spurious correlation rests on the popular confusion between correlation and causation.

The literature on price-value relations has frequently used correlation measures in testing the theory of labor value--that is, values are good proxies to prices or, alternatively, they explain, in some sense, prices. However, several authors have detected important problems that affect those...