The governments. They recognize market failures and mitigate with things like the carbon tax. In fact, the whole concept of a market, even the traditional physi

The governments. They recognize market failures and mitigate with things like the carbon tax. In fact, the whole concept of a market, even the traditional physical one, by definition implies regulation with enforcement (e.g. weights and measures). Without those, there's no market, there's just a free for all.