Ed brought his car to Larry's Lube for an oil change. After Larry completed the oil change, he presented Ed with a bill for $100. Ed, after recovering from the shock, said, "No one charges more than $25 for an oil change...This is highway robbery!" After much discussion, Larry and Ed agreed to settle for $50, which Ed paid. Larry then brought a Small Claims action for the remaining $50 balance. Will Ed be obligated to pay?