A study published in 2011 by the OECD noted that Group of answer choices the real household income of unskilled workers in the United States increased more in comparison to that of skilled workers. in almost all countries real income levels declined over the 20-year period studied. the falling unemployment rates brought gains to low-wage workers and fairly broad-based wage growth. the gap between the poorest and richest segments of society in some OECD countries had widened.