In this guide, experts explain how to build and use computer models to understand international trade better. They teach using simple programs to analyze many trade questions. Their models help see how trade policies affect economies. By putting together basic parts step by step, even non-experts can learn how to use these models. This book is helpful for students and researchers wanting to analyze trade issues with computer simulations. The book explains different aspects of trade like production, costs, and market equilibrium. It also covers topics like tariffs, taxes, and how different countries trade goods. By showing examples and providing detailed instructions, this guide makes it easier for anyone interested in trade to use these complex models effectively.