I recently moved to Canada from the US, and there's stores here that do the coin-deposit for shopping carts--and have folks bag their own groceries. I know the latter would save money, but the former makes sense, too--labor costs are higher, there's liability, and honestly, having wayward carts about the parking lot makes it look a bit unkempt. I bet there's folks who'd gladly pay a quarter--or more--just to have a decent cart that hasn't been beaten by cars and rain.