Trading Up: One Woman’s Quest to Swap a Hairpin Demi Skipper is going to get a house by trading for it. She traded a hairpin for a pair of earrings, the earrings for four margarita glasses, and the glasses for a vacuum cleaner. Now she is looking to trade a Chipotle celebrity card that gives unlimited free Chipotle food for a year. Is barter a means of payment? Is barter just as efficient as money? Explain?