Income inequality is just one of the many social, ecological, economic and and political crises facing ordinary working people. The "progressive" reforms listed never mention the underlying cause as the economic system of capitalism. The capitalist economic system is designed to make a few capitalists filthy rich by exploiting and impoverishing everyone else.
Merely raising wages is not a solution as employers cut and eliminate work benefits (health care, pensions, etc.)
Capitalists merely find new ways to cut and eliminate taxes, corrupt politicians, move overseas, manipulate the stock market, etc. anything to maximize profit.
For a brilliant examination, with several graphs, check out this article:
Wages and Wall Street
by Barry Grey
15 July 2017 (wsws.org Perspective Editorial Comment)
"Adjusting for inflation, real wages in the US have, according to this index, fallen by 7.5 percent since 2006. In real terms, average wages in the US peaked more than 40 years ago."
"The share of the US gross domestic product going to labor has fallen to the lowest level since the end of World War II, while the share going to corporate profits has hit record highs"