Many years ago, in “The Communist Road to Self-Enslavement” (included in After the Open Society, a collection of Karl Popper’s papers edited by Jeremy Shearmur), I discovered the following sentence: “Like myself, [Ludwig von Mises] appreciated that there was some common ground, and he knew that I had accepted his most fundamental theorems and that I greatly admired him for these.”
As I respect both Popper and Mises as great thinkers, although thinkers who had differences, I was surprised. To be sure, in the paragraph containing the above sentence, Popper does discuss their differences, and then there is Mises’s disagreement with Popper in The Ultimate Foundation of Economic Science, where he writes in bold language,
If one accepts the terminology of logical

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