Book excerpt: This monograph consists of six major parts, elaborating on basic aspects of mezzoeconomics, the theory of regional government foresighted leading, the dual-role theory of regional government, the dual-entity theory of regional government, the double-strong mechanism theory and the theoretical configuration of mezzoeconomics as well as the prospects for its development. It gives a full exposition of the core issues, approaches and methodological principles of mezzoeconomic researches, their breakthrough improvements upon traditional economic theorization and the broad prospects for innovative practices. This monograph fills up a blank in the theoretical system of modern economics and signifies a substantial amelioration of the theorization of modern market economy. It demonstrates through forceful exemplification and argumentation that there exists in between microeconomics represented by the enterprise and macroeconomics represented by the state mezzoeconomics represented by regional government in the system of modern economics and that both enterprises and regional governments are entities of market competition in the modern market theory, which remedies the theoretical defects in traditional economic and market theories and redefines the theories of modern economics and modern market economy.