Which rule ended the permanent binding of players after contracts expired, increasing mobility?

• A. Reserve Clause
• B. Bird Rights
• C. NIL
• D. Seitz Rule

Answer: (D)

Ending the permanent binding of players after contracts expired changed how freely players could move between teams. The old system, known as the reserve clause, kept players tied to a single club even after their contract ended, preventing them from seeking new opportunities. The turning point came with the Seitz ruling in 1975, where arbitrator Peter Seitz declared that the reserve clause could not legally bind a player once a contract had expired. This created free agency, allowing players to negotiate with other teams and pursue better deals, which massively increased mobility. The other options don’t fit because the reserve clause describes the old, binding system; NIL relates to college athletes’ ability to profit from their name, image, and likeness; and Bird Rights are a later mechanism related to salary-cap discussions, not the rule that ended long-term binding.