This document provides an overview of investment law and policy for LLM students. It begins by defining investment and distinguishing between domestic and foreign investment. It notes that while there is no single definition, investment generally refers to the expenditure of assets to generate profits. The document then examines Ethiopia's investment proclamation and its definitions. It also discusses different theories of foreign direct investment, including the classical, dependency, and middle path theories. Finally, it analyzes sources of international investment law such as treaties, customs, and judicial decisions, with a focus on the growing importance of bilateral investment treaties.