The Dutch government recently implemented a new law regarding the recycling on tin cans that has monetized this form of trash. You can now hand in most coca cola, 7-up, or whatever brand tin at your local supermarket for 0.15 eurocent per piece.
This new incentive has people now opening up trashcans everywhere around the city and scavenging them for this monetary reward. Some guys are even using grapples and magnets to reach the hard to get cilinders. It appears that for some this has become their new job and they hand in full cart loads of this trash for the reward.
The receipts for this collection effort can only be exchanged for food, i.e. it is a discount on your grocery bill.
I wonder whether the best of them even exchange the receipts for a discount but to receive cash, as they've gone beyond their sustenance needs and require something more liquid. Or they might stack some kind of food item that maintains its value over time... who knows what this new economy is creating for interesting kinds of behavior.