If it's the externalities, we need to make them part of the cost. Sure. But you say that as if it's easy. In some cases it's not trivial to put a monetary figu

If it's the externalities, we need to make them part of the cost. Sure. But you say that as if it's easy. In some cases it's not trivial to put a monetary figure on these things. This may be why they are an externality in the first place. More importantly, in each case where you intend to make someone pay for something they are used to getting for free, they will resist that change, even if that something is the right to pollute the river. Making externalities part of the cost has always been a struggle. Nevertheless, I agree in principle.