The average worker—unionized or not— working in a right-to-work state earns approximately $1,500 less per year than a similar worker in a state without such a law

Unions strengthen businesses and the economically vital middle class by giving workers a voice in both the workplace and our democracy. Unions do this by pushing for fair wages and good benefits, and also by encouraging citizens to advocate for middle-class-friendly policies like a strong Social Security system and family-leave benefits.

In fact, according to a recent study conducted by the Center for American Progress Action Fund, strengthening unions is as important to the middle class as boosting college-graduation rates. Similarly, sociologists Bruce Western and Jake Rosenfeld of Harvard University and the University of Washington, respectively, have calculated that approximately one-third of the increase in male wage inequality from 1973 to 2007 was due to decreasing unionization—about the same amount they ascribed to the increasing payoff of a college education.

Not surprisingly, right-to-work laws have a negative impact on the middle class. The average worker—unionized or not— working in a right-to-work state earns approximately $1,500 less per year than a similar worker in a state without such a law. Workers in right-to-work states are also significantly less likely to receive employer-provided health insurance and pensions. If benefits coverage in non-right-to-work states were lowered to the levels of states with these laws, 2 million fewer workers would receive health insurance and 3.8 million fewer workers would receive pensions nationwide. And unions tend to especially make large income differences for communities of color in the United States.

All of the states with the lowest percentage of workers in unions—Mississippi, Arkansas, South Carolina, North Carolina, Georgia, Virginia, Tennessee, Texas, South Dakota, and Oklahoma—are right-to-work states and they all have a relatively weak middle class, with the share of total state income going to the middle 60 percent of the population below the national average.

Over the past several decades, unions in Michigan have weakened and the middle class has been hollowed out—a trend that would significantly worsen if right-to-work became law. As we see in the data, as union membership has declined in the United States, so too has the share of income going to America’s middle class. (see Figure 1). In 2011 the middle class received the smallest share of the nation’s income since these data were first reported, according to U.S. Census Bureau, with the middle 60 percent of households receiving only 45.7 percent of the nation’s income that year, down from the historical peak of 53.2 percent in 1968. Since 1968 the share of households in unions has declined from nearly 30 percent to less than 12 percent today.

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A strong union presence in any area drives wages up. Non union business have to offer wages that are comparable to union wages (and benefits) in order to compete for workers.

So, of course big business and by extension the GOP hate unions.