Whyy are not the externalities owned by the owner of the product?
I can think of only 2 reasons:
- the consumer was forced to purchase the product without an option with dire consequences. In this case, the dominator is responsible. This is pretty much anything your taxes buy.
- the producer lied or hid something about the product. In this case, the liar is responsible. E.g., the lies about recycling plastic, the outcome of using internal combustion engines, the safety of leaded gasoline. The list of that is simply enormous.
What other complications do you see?