How does rational choice institutionalism explain political decisions?

Rational choice institutionalism explains political decisions by positing that actors are rational individuals who pursue their own interests within the constraints of specific institutional settings.12

Rather than viewing institutions as irrelevant, this approach argues that they structure the opportunities and incentives available to political actors. Decisions are explained as strategic calculations where individuals adhere to formal rules and norms to maximize rewards and avoid sanctions. For example, a legislator’s vote may be determined by how that action influences their prospects for reelection or career advancement, with the specific institutional framework—such as the level of party discipline—dictating the range of viable choices.12

By focusing on how institutions define the costs and benefits of various actions, rational choice institutionalists analyze how these structures influence the stability of a political system and determine the level of consensus required to alter the status quo. Ultimately, this perspective seeks to model political behavior by assuming that actors operate as utility-maximizers whose strategic interactions are fundamentally shaped by the rules of the game.21