McDonald’s and Walmart, the two biggest private-sector employers in the U.S., don’t pay their workers much. This more or less eternal truth is making one of its increasingly frequent appearances in the news this week. McDonald’s is catching flak for a “sample monthly budget” for employees that sets aside $20 a month for health insurance and no money at all for heat. (Hey, it’s July.) Walmart, meanwhile, is threatening to cut back on plans to open stores in Washington, D.C., after the D.C. council voted to impose a “super minimum wage” of $12.50 an hour on big retailers.