Some people doing that is not enough to assume significant shifts in market forces will happen. The question is will enough people do that? I agree, a price si

Some people doing that is not enough to assume significant shifts in market forces will happen. The question is will enough people do that? I agree, a price signal might send some people finding solutions, but I'm afraid that a lot of the solutions would cost more than the savings, so that would reduce the field of what is possible. And mostly, I wanted to underline that simply sending a price signal is sometimes not enough for certain markets and does not scale too well by itself.