I've seen it work! If I hadn't, I might question it. My comment wasn't wondering whether there are more carts left in the parking lot of an Aldi or a Price Cutter, it was wondering if more carts get taken off property entirely and used for other purposes. If that's your goal, a quarter is pretty negligible. Years ago I worked at motel near an Aldi and a WalMart, and saw a good number of both companies' carts left in the parking lot. More WalMart carts, for sure, but they also get more traffic. I used Price Cutter as an example instead of WalMart because I think some people have a special hatred for that particular company that might make stealing from a WalMart easier to rationalise for other reasons (I'm not making a value judgement about that, just stating it as something I've anecdotally observed).

Efit: s/anf/and

It's a whole euro though, so maybe it's high enough that it has more effect than a quarter dollar.

Though not all stores have a deposit for carts, Colruyt in Belgium doesn't for example, and I don't see carts lying around.