The term 'PUTS A CAP ON' can be summarized as 'LIMITS'. This phrase is often used to describe the act of setting a limit or boundary on something. For example, a company may put a cap on the number of employees they are willing to hire, or a government may put a cap on the amount of money that can be spent on a certain project. In either case, the idea is to set a limit or boundary on something in order to control it.