Introduction.- PART 1 THE GERMAN CONTRIBUTION 1883-1914.- Friedrich Engels and the Marxian Legacy, 1883-1895.- Engels and the 'Prize Essay Competition' in the Theory of Value.- First Debates in Value Theory, 1895-1914.- Bernstein, Kautsky and the Revisionist Controversy.- Finance Capitalism and Imperialism: Karl Kautsky and Rudolf Hilferding-. Capital Accumulation, Imperialism and War: Rosa Luxemburg and Otto Bauer.- PART 2 THE RUSSIAN CONTRIBUTION TO 1917.- The Inheritance of Russian Marxism.- The Political Economy of Plekhanov Populism and Orthodox Marxism in the 1890s.- Russian Revisionism.- Lenin's Political Economy, 1905-1914.- Trotsky on Uneven and Combined Development.- Imperialism and War: Bukharin and Lenin.- PART 3 SOCIAL DEMOCRACY AND COMMUNISM 1917-1929.- The Revival of Revisionism.- Communist Economics in the 1920s.- Henryk Grossman and the Breakdown of Capitalism.- Conclusion: Marxian Economics in 1929.