Your credit card rewards are funded by a de-facto tax on the poor. Rewards are financed by "swipe fees" -- the fee stores pay to banks when you use credit. To offset these costs, stores typically raise prices -- even for low-income customers who tend to pay in cash (and get no rewards). Thus, the system channels money from low-income Americans to the affluent. We can mitigate this injustice by following the EU's lead and capping swipe fees. vox.com/politics/506417/cred…