Investigating the base ground of economic growth as a mathematical model is an essential economic issue. Every economic entity does economic behaviors to maximize its goal, total utility, in a given time. By bringing out the premises of the game theory, market participants, transactions, and market entities-related agents are defined. Next, concerning the general regional economy, the transaction model in the market participants could be set. And finally, a law and economics notion to set a model of economic growth would be drawn.