This paper sums up an extended debate which Andrew Kliman and I conducted with Simon Mohun and Roberto Veneziani. It should be cited as ‘Simultaneous Valuation vs. the Exploitation Theory of Profit: A summing up’, Capital and Class #94, Spring 2008, pp101-111. It was reprinted in In Kliman, A. and N. Potts. (eds) 2015. Is Marx’s Theory of Profit Right?: The Simultaneist–Temporalist Debate. Lanham, MD: Rowman and Littlefield. See also our 2006 Reply to Mohun