Government policy has a profound effect on the type and volume of private investment in developing countries. The mistake of many governments which want to promote domestic manufacturing industries is to protect them with import barriers and subsidize their costs through repressed interest rates and overvalued exchange rates. Supplementing these policies by price controls and subsidies designed to help the poor tends mainly to benefit those who could afford to pay more. The overall result is a boost in consumption which encourages local producers to concentrate on the home market and neglect exports, reducing foreign exchange earnings.