Chapter 1 The neoclassical and a Post Keynesian theory of investment, M.J. Gordon; Chapter 2 The investment function: five propositions in response to Professor Gordon, Douglas Vickers; Chapter 3 Financial theory and the theory of investment, Joel Fried; Chapter 4 Neoclassical and Keynesian approaches to the theory of investment, James R. Crotty; Chapter 5 Is investing for the long term theory or just mumbo-jumbo?, Peter L. Bernstein; Chapter 6 Investment, capital, and finance: corporate and entrepreneurial theories of the firm, Edward E. Williams; Chapter 7 On the Keynesian investment function and the investment function(s) of Keynes, Robert S. Chirinko; Chapter 8 The user cost of fixed capital in Keynes’ theory of investment, Johan Deprez;