Private investment: an empirical analysis for Brazil - This study identifies the determinants of private investment in Brazil over the period of 1970 to 2005. The paper presents the main investment theories, and recent developments of these theories, as well as how they can be applied to Brazilian data. The results indicate that increases in income and economic activity have positively influenced private sector investment in Brazil. The reduction in credit volume and the existence of political and economic instabilities are shown as being harmful to private investment in the analyzed period. The implementation of public policies that can guarantee economic stability and improve the government's credibility, along with increases in credit offer, may boost private investment in Brazil.