At least in France, it's both. The cost for the patient is usually low thanks to the health insurance, but also because of price control. A GP visit is 25 euros by law, covered from 70 to 100% depending on your insurance. Doctors can choose to charge more but then patients need better private insurances to be reimbursed.

You can find the price lists here:

* https://www.ameli.fr/paris/medecin/exercice-liberal/facturat... * https://www.ameli.fr/paris/medecin/exercice-liberal/facturat...