original_query: What is Prim-Read theory and how did it impact game theory?
query: What is Prim-Read theory and how did it impact game theory?
answer: Prim-Read theory, or Prim-Read defense, is a game theory concept that analyzes the cost-effectiveness of anti-ballistic missile (ABM) systems. It considers the cost of deploying defensive missiles and calculates the damage reduction they provide.  This theory significantly impacted game theory by demonstrating that building more offensive missiles could be cheaper than creating an effective defense, influencing the development of the 1972 ABM treaty.