In different countries, there are different practices. We need to be careful because sometimes you need to embrace the whole thing at once.
What is interesting is that having no copayments in some countries is something that's absolutely great in terms of better access. Some countries, like Australia and the Netherlands, emphasize a lot the more appropriate use of medicine. Denmark is maybe pushing this idea to the extreme of more appropriate use of medicine by having a specific agency take care of that in terms of trying to influence the prescribing habits of doctors.
What I like as well is the New Zealand system, the idea of having a depoliticized national agency. Based on the budget they receive, their mandate is very simple and very clear: maximize the therapeutic benefits for every dollar spent by the agency.
Then you have a whole system that uses every trick in the book, but for every dollar you spend, you want to get the most out of it, so you reduce opportunity costs and you reduce waste with that.
In terms of these different practices, these can be interesting examples.