A survey of 350 companies sheds light on the pay gap between executives and rank-and-file workers in different industries.

The survey, conducted by Equilar, a firm that specializes in compensation, finds that the largest gap exists in the retail sector, where the median employee only makes $13,000 a year, 669 times less than the typical retail CEO, who makes $8.7 million a year. Granted, much of that disparity is due not just to low wages in the retail sector but its large number of part-time workers.

There is also a large disparity in the health care sector, where the typical CEO makes 150 times more than the median employee. Health care features a wide range of compensation: highly paid executives of insurance companies and health care providers, doctors who make well into the six figures, nurses with solid middle class salaries and low-wage home health care aides.