Reconfirming Karl Marx's rate of surplus value

In Van Den Berg and Smith's comment that precedes this reply, I note their concession to the major conclusions of my 1982 comment. They no longer directly challenge my conclusions 1 / that there has been a general increase in the exploitation of labour by capital in the twentieth century despite fluctuations from decade to decade, nor 2 I the positive correlations between the rate of surplus value and strikes, especially between 1945 and 1966. …