Paul Collier's contributions to development economics,and in regard to Africa in particular, have marked him out as one of the most influential commentators of recent times. His research has centred upon the causes and consequences of civil war, the effects of aid, and the problems of democracy in low-income and natural-resource-rich societies. His work has also enjoyed substantial policy impact, having seen him sit as a senior adviser to Tony Blair's Commission on Africa and addressed the General Assembly of the United Nations This collection of Collier's major writings, with assistance from Anke Hoeffler and Jan Gunning, and accompanied by a new introduction, provide the definitive account of a wide range of macroeconomic, microeconomic and political economy topics concerned with Africa. Within macroeconomics, there is a focus on external shocks, exchange rate and trade policies, whilst microeconomic topics focus upon labour and financial markets, as well as rural development. Collier's book The Bottom Billion had become a landmark book and this summation of the research underpinning it will be a superb guide for all those concerned with African development.