When you arrive at baggage claim and your luggage is more than you can push yourself, many airports around the world have carts for you to use for free. In the U.S. it’s far more common for you to pay to use a cart, like one from SmarteCarte. You’ll pay around $5 to release the cart at a nearby station, and then you can move your bags from the carousel to your ground transportation. Someone has to collect the carts, and then they get re-rented again.
But what if that $5 paid to rent the cart for an indefinite period of time?