Incentives matter. If theres no downside to using a service people will use the service more. Single payer removes much of the downside to using medical care so

Incentives matter. If theres no downside to using a service people will use the service more. Single payer removes much of the downside to using medical care so people will look for medical care where they wouldnt before. To solve this single payer systems need ways to stop people from receiving care they dont need, and heuristics are imperfect so that will stop some people who actually do need care too.