The paper argues that the several theories used to support the traditional thesis of a dependence of investment on the interest rate are all unconvincing. The following theories are reviewed: pre-Keynesian, Keynes, array of opportunities, Lerner, Jorgenson, adjustment costs, Tobin's q. It is...

Most developing and underdeveloped countries beside Sudan suffer from low levels of income in addition to the low savings that are result from the lack of sophisticated savings channels. Hence, investments depend on the individuals' abilities on savings where they are major motivating vehicle...

Investment is one of the crucial macroeconomic variables - it adds to the capital stock and thus determines the long term production capacity in the economy. Investment, also, is one of the channels through which macroeconomic policies, monetary and fiscal policy, can affect the real economy....