The approach that researchers have recently adopted to further our understanding of how economic interactions between countries 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 of the book aims to answer the following two questions: First, what contributions do national and geographic borders make to our understanding of macroeconomics? Second, how will these contributions change as the world becomes more integrated?