Biological invasions - the introduction of living organisms beyond their original range - are one of the main drivers of biodiversity loss. This text represents an effort to understand the economic causes and consequences of biological invasions. It discusses the theoretical and methodological issues raised by invasion, including control strategies, modelling options, and a study of the economic, institutional and policy conditions that predispose countries to biological invasions. Also included are case studies of fisheries, agricultural systems, tropical forests and protected areas affected...