[jrm2k6]

That's probably why in the US nobody put their cart back. They would do it if they had to get their coin back. Again, to fight laziness, go for the wallet!

[philwelch]

I've been to grocery stores in the US where there's a perimeter sensor that automatically locks up at least one of the wheels of the shopping cart.

[theshrike79]

And if people won't, there would be droves of people taking the carts and keeping the quarters.