This has happened to almost everybody.  You walk into a market or other big store and take a cart.

About ten steps from the door the cart starts to exhibit bad cart behaviors.  Like pulling to the left or a banging wheel or hard to push.  You can go back and change carts or you can just tough it out.  What you can’t do is pull the cart out of the inventory and make sure that no one else has to suffer with it.  Now you can because I have invented the bad cart tag.

This is just an illustration the final product will be made like one of those hospital bracelets that you need tools to remove.  The tags will be available at the checkout register.
Soon a retailer, like Home Depot (this is for illustration purposes only) will implement a bad cart program, shoppers will like always getting a good cart, they will, in the margin, shop more at Home Depot and the increased profits and goodwill will pay for the extremely low cost of the program.
If you know someone who runs a retail store with carts or someone in the tag business please forward them this idea.  They can make some money with this little idea and we can all benefit.
Some people see a problem and complain.  Some people see the opportunity that the problem creates and prosper.