It’s a form of socialised healthcare where the government negotiates the prices with medical companies. The government of an entire country negotiating prices carries way more bargaining power than individuals so it means the prices are much lower. Combine that with taxes paying for healthcare and you have a nice healthcare system

Edit: in some cases it’s just one guy paying, in this case it’s Alan: https://www.thebeaverton.com/2017/08/poll-canadians-love-single-payer-healthcare-except-alan-single-payer/