This article is part of “Unaffordable America,” a series examining rising economic inequality in the U.S. and the policies that drive it. RUCKERSVILLE, Va. — At the Tiger Fuel gas station and convenience store near the foothills of the Blue Ridge Mountains, the managers expect to pay more in fees to credit card companies this year than they will on rent — one more expense weighing on the company and its customers amid the surging price of gas. Those credit card fees — which can be as high as 5%