Arguably the most important conservative economist of the last 50 years went on television on Tuesday to argue that the poor, people of color, and other marginalized people aren’t “worth” $15 an hour. Art Laffer, an economist in the Reagan White House, appeared on Fox News to discuss the terrifying prospect of raising the minimum wage for fast-food workers to somewhere above the poverty line. Laffer is the brains behind supply-side or “trickle down” economics, which has been Republican orthodoxy since the Reagan administration, and is the namesake of the “Laffer curve.”