Personally I like the way Aldi does it. To get a cart, put a quarter in the mechanism near the cart handle and the chain releases from the cart in front of it. Do your thing and return the cart to the cart corral, put the chain into your cart holder and out pops your quarter. Efficient. Works for me, folks bring their carts back, and possibly one less employee at the store rounding up carts.
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I have CDO. It's like OCD but all the letters are in alphabetical order - AS THEY SHOULD BE. 
"Yesterday Belongs to History, Tomorrow Belongs to God, Today Belongs to Me"
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