Historically, the study of international trade and finance has focused on the movements of goods and capital between nations. But as countries are becoming more integrated, the macroeconomic role of national borders is diminished. The approach that researchers have recently adopted to further our understanding of how economic interactions between nations will evolve as national borders decline in importance is to analyze economic interactions within a country (i.e., 'intranational macroeconomics'). This book brings the intranational macroeconomics literature into clearer focus by collecting the strands of research into a common thread. Each chapter attempts to answer the following two questions: first, what contributions do national borders make to our understanding of macroeconomics? Second, how will these contributions change as the world becomes more integrated?