This book aims at reviewing the application of neo-institutional economics. Chapter 1 studies the impact of formal and informal institutional arrangements on provisions of fittings in Hong Kong, Boston and Nanjing. Chapter 2 reviews the invitation to treat and invitation to offer in shops based on transaction costs theory. Chapter 3 proposes that the enforcement of private property rights is important in a country's economic growth. Chapter 4 sheds light on the the linkage between legal enforcement and firms'size. Chapter 5 studies the FDI spillover effect on African economy.