The Social Security program was designed to support lower-income retirees more by replacing a larger share of their past earnings than higher earners receive. But the subsidies that encourage workers to save for retirement tilt in the opposite direction. For this reason, White workers – who tend to earn more than Blacks and Hispanics – receive a disproportionate share of the employer matches and federal tax breaks embedded in 401(k)-style savings plans, according to a study of workers with these plans. White workers start out saving more. They contribute 4.2 percent of their earnings, on average, and their employer matches add another 2.1 percent for a total saving rate of roughly 6 percent, the researchers at MIT, Harvard, Yale, and t…