Here is a start

http://www.forbes.com/sites/jeffreydorfman/2014/05/06/seattle-will-hurt-local-economy-with-15-an-hour-minimum-wage/

Other issues are that they are counting stock options (where most of their "pay" happens), and that companies are much much much larger now than they used to. Distributing all CEOs pay now to their workers would result in almost no increase in the pay of the workers. In fact, when you look at the data in the way it should be looked at, fewer people are earning the big bucks which imo is better. Before when companies were much smaller there were actually more CEOs to the average worker and more of their compensation was from revenue, not stock, and so there was a bigger effect on the average worker. But whatever, people just want to see an infographic and get worked up and not actually understand what the crap is going on.