it is perfectly possible for a monopsonistic single payer to use its market power to set reimbursement tariffs too low (below economically reasonable), making providers feel it legitimate to circumvent the rules and game the system.
game (third-person singular simple present games, present participle gaming, simple past and past participle gamed)
game the system
To use the rules and procedures meant to protect a system in order to instead manipulate the system for a desired outcome.
game the system - Wiktionary
game
(intransitive) To gamble.
(intransitive) To play video games.
(transitive) To exploit loopholes in a system or bureaucracy in a way which defeats or nullifies the spirit of the rules in effect, usually to obtain a result which otherwise would be unobtainable.
game - Wiktionary