Adding to that, a lot of homeless people have to dumpster dive to get out those returnable bottles, which obviously is pretty humiliating. So some guys first developed stickers saying "Bottles belong next to the trashbin" and put them on a lot of trashbins - later, another group invented the "Pfandring" or deposit ring which is attached to a trashbin and asks you to put your bottle in the ring, not the trashbin.

I find it fascinating how small regulatory practices can have enormous social effects.

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