[creer]

Or, via lower price - negative if necessary - you let someone else go to the trouble, via facilities that they themselves invested in. Also in systems like this, there is not necessarily anything special about "zero" or "negative". It's just "less than the previous number" or "more incentive this way than the previous number".

[imtringued]

The idea that negative prices are something weird is pretty silly.

A negative price indicates that the person sellers disposal technique is worse than the buyers disposal technique. In other words, the market is working as intended.

Nobody is complaining about the cost of garbage disposal where people are paying for having less (!) stuff.