Rothbard wrote a series of polemics in which he deprecated a number of leading modern economists. He vilified Adam Smith, calling him a "shameless plagiarist" who set economics off track, ultimately leading to the rise of Marxism. Rothbard praised Smith's contemporaries, including Richard Cantillon, Anne Robert Jacques Turgot and Étienne Bonnot de Condillac, for developing the subjective theory of value. In response to Rothbard's charge that Smith's "The Wealth of Nations" was largely plagiarized, David D. Friedman castigated Rothbard's scholarship and character, saying that he "was deliberately dishonest or never really read the book he was criticizing". Tony Endres called Rothbard's treatment of Smith a "travesty".