While not the reason for "Pfand" in Germany (originally it's to encourage reuse of bottles, now it's expanded to include recycling), this is a pretty good analo

While not the reason for "Pfand" in Germany (originally it's to encourage reuse of bottles, now it's expanded to include recycling), this is a pretty good analogy. Including the points beyond which it fails: You get emptied trash cans because people tried to get at the Pfand... Which brings you back to the original point: People are far better at gaming a system than the system is at setting its rules