This book, in its second edition, introduces readers to the economics of immigration, which is a booming field within economics. The main themes and objectives of the book are for readers to understand the decision to migrate, the impacts of immigration on markets and government budgets and the consequences of immigration policies in a global context. Our goal is for readers to be able to make informed economic arguments about key issues related to immigration around the world. This book applies economic tools to the topic of immigration to answer questions like whether immigration raises or lowers the standard of living of people in a country. The book examines many other consequences of immigration as well, such as the effect on tax revenues and government expenditures, the effect on how and what firms decide to produce and the effect on income inequality, to name just a few. It also examines questions like what determines whether people choose to move and where they decide to go. It even examines how immigration affects the ethnic diversity of restaurants and financial markets. Readers will learn how to apply economic tools to the topic of immigration. Immigration is frequently in the news as more people move around the world to work, to study and to join family members. The economics of immigration has important policy implications. Immigration policy is controversial in many countries. This book explains why this is so and equips the reader to understand and contribute to policy debates on this important topic.