Let's say I pick up some trash at the local park. Plenty of positive externalities there.
But if I then send the community a bill afterwards, I don't think it will go over very well. Even if they all appreciate the effort they might object, on any number of grounds:
- There are other trash pickers who are more efficient and can be hired more cheaply.
- There are other higher priority projects to which those funds should be allocated.
- That the quality of the trash picking was not in line with the bill.
- And on and on.
If I want to get paid for picking up trash I'll have to work it out with the community before hand. And then there will be expectations, contracts, a supervisor, and all those things that come with jobs.