Starbucks is the worst offender, but jaw-dropping gaps are the norm among America's leading low-wage corporations. CEOs of the 100 S&P 500 firms with the lowest median wages - a group I call the "Low-Wage 100" - have enjoyed skyrocketing pay over the past six years. As a group, these CEOs now earn 632 times more than their median employees, I found in a new report for the Institute for Policy Studies.