1974 [1991]. A survey of the theory of the decision to invest and a critique of the neoclassical emphasis on the interests or on the normal profits. Investments, as the classical economists knew, depend essentially on profit expectations substantially higher than the interst rate. Variations in the expected profit rate are more important in explaining capital accumulation than variations in the interest rate. It elaborates "A decisião de investir, os lucros e os juros". (Paper: Texto para Discussão FGV Economia)