Abstract:Traditional international trade theory remains relevant in the process of games between countries、The pursuit of power to expand one’s relative strength lacks consideration。In the context of great power competition，The importance of power in trade between first-developing countries and late-developing countries is even more prominent。Based on this，Introducing the element of power into the classic two-country trade theory，Regard the absolute welfare that economics focuses on and the relative welfare that political science focuses on as the dual goals of actors，Use game theory methods，A concise model can be established for the bet365 refer a friend code、Convenient、Close to reality、A widely applicable analytical framework for international economics and politics。This can be found，In a two-state game composed of a first-mover country and a late-mover country，Later-developing countries prefer the strategy of “leveraging their own strengths to make up for their own weaknesses”；First-mover countries prefer the strategy of "suppressing the other's shortcomings and promoting the other's strong points"，Once the comparative advantage is determined, the technological gap changes from large to small，First-mover countries are more inclined to comprehensively suppress late-mover countries or even "decouple"。

　Keywords:bet365 refer a friend code, Trade, Power, Welfare, Double Efficiency

　　AuthorZhang Yuyan，Professor, School of International Political Economics, University of bet365 refer a friend code Social Sciences (Beijing 102488)；Xia Guangtao，Associate researcher at the Institute of World Economics and Politics, bet365 refer a friend code Social Sciences (Beijing 100732)。