This document provides an overview of international economics, covering topics such as global trade, factors affecting trade between countries, intra-industry trade, strategies for entering foreign markets, import-substitution industrialization, and more. It discusses the concept of global trade, reasons for countries to trade with each other, factors affecting trade according to the gravity model, the impact of changing composition of trade on trade volume, intra-industry trade and its popularity, strategies used by firms to enter foreign markets, dumping pricing policy, import-substitution industrialization, the infant industry argument, and potential problems with adopting import-substitution industrialization. References are provided for further reading.