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NBA free agency is often framed as media spectacle, yet its outcomes follow a patterned logic of constraint and calculation. This paper reinterprets free agency through James S. Coleman’s rational choice sociology, which links purposive action to institutional design and shows how individual choices aggregate into systemic outcomes. Within the league’s salary-cap and contract rules, players, agents, and executives act as purposive actors embedded in networks of trust, information, and reputation. Using the 2010 LeBron James “Decision” as an illustrative case, the analysis traces how individual optimization within constraint triggered broader shifts in organizational behavior and cultural norms of player agency. Four propositions are advanced regarding the mechanisms of social capital, public visibility, institutional rules, and aggregation, revealing how rational action is socially conditioned and cumulatively transformative. The framework demonstrates that free agency functions as a micro-to-macro system of structured rationality where repeated decisions generate emergent norms and institutional change. By grounding a highly visible sport market in Coleman’s architecture of purposive action, this paper extends rational choice sociology into the domain of sport and contributes a general model for understanding how constrained individual decisions reproduce and modify social organization.