This reminds me of a story I heard (read?) a long time ago. At Disney World they had a rule about a garbage can being within a 10 foot distance of basically anywhere in the park. The logic was that when a garbage can is nearby, there is additional social pressure not to litter, and the result was that they were able to save money on park cleanup because people used the cans.

When I see lone overflowing garbage cans in big cities I think about this.