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This reminds me of something they do in The Netherlands all the time, especially in small towns. They set up an improvised, unguarded stall of some kind with a sign for all the prices and a money box in their own front yard. They trust people to take an item they want and leave the money in the box.
More examples:
http://www.najibnafid.com/?catnumbr=2&language=&project=2&leftmenu=projects&prjct=Stalletjes+langs+de+weg+2
