Investment potential in the theory of J. Keynes and M. Kaletsky

This article considers the investment activities as a basis for economic development in the theories elaborated by Keynes and Kaletsky, describes their contribution to the establishment of economics as a science. The author advances the arguments regarding upgrade of the Keynesian theory in the works of Michal Kaletsky. J. Keynes and M. Kaletsky had different opinions on some questions regarding the investment, in particular, on the marginal efficiency of capital in the investment environment. The research presents evaluation of the investment development level in the contemporary Russian economy.