Why dont they just have a " fee" to unlock the cart, think " insert" 25 pesos ?
Then you get the 25 pesos back when you return the cart to a " stand"/cart parking thingy.
Pretty sure that even though most people will not be bothered to take the cart back, some entrepreneurs will gladly do it to get the 25 pesos.
Now I say 25 pesos because thats the highest denomination coin, but we could imagine it being 50 pesos as in 2 coins to unlock.
Then you get the 25 pesos back when you return the cart to a " stand"/cart parking thingy.
Pretty sure that even though most people will not be bothered to take the cart back, some entrepreneurs will gladly do it to get the 25 pesos.
Now I say 25 pesos because thats the highest denomination coin, but we could imagine it being 50 pesos as in 2 coins to unlock.