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Rudolf Hilferding (10 August 1877 – 11 February 1941) was an Austrian-born Marxist economist, socialist theorist, politician and the chief theoretician for the Social Democratic Party of Germany (SPD) during the Weimar Republic, being almost universally recognized as the SPD's foremost theoretician of the twentieth century. He was also a physician. He was born in Vienna, where he received a doctorate having studied medicine. Wikipedia