http://thinkprogress.org/economy/2015/02/24/3626213/right-to-work-hearing/
"Speakers cited studies that found that all workers in “right to work” states, regardless of whether they belong to a union, lose an average of $1,500 a year in wages as a result of these laws. Others focused on how Wisconsin workers have already been hit by Scott Walker’s policies over the last few years. According to the Census Bureau’s American Community Survey, median household income in Wisconsin has dropped since the passage of the Act 10 in 2011, and is currently about $800 below the national average."