It does, but it is also supposed to bring up the hidden costs of buying things in their prices, so that greener products that would do less harm would be cheape

It does, but it is also supposed to bring up the hidden costs of buying things in their prices, so that greener products that would do less harm would be cheaper than more destructive goods. For example, a plane ticket might be cheaper than a train one for the same trip but it costs more to the community in the long term because of global warming.