As foreign direct investment of U.S. multinational firms increases rapidly, some key questions emerge from this trend: What is the true nature of multinationality and what are its impacts on firm performance? Both questions are answered in this book through an examination of the nature of multinationality and its alternative measures and the effect of the degree of multinationality on firm performance, where firm performance is expressed by firm value, financial performance, prediction performance of earnings forecasts, diversification strategy and ownership structure, and corporate financing. The book is of value to all those interested in international business, finance and accounting issues, including professional accountants, business executives, teachers, researchers, and students.