71) A study published in 2011 by the OECD noted that
A) the real household income of unskilled workers in the United States increased more in
comparison to that of skilled workers.
B) in almost all countries real income levels declined over the 20-year period studied.
C) the falling unemployment rates brought gains to low-wage workers and fairly broad-based
wage growth.
D) the gap between the poorest and richest segments of society in some OECD countries had
widened.
72) A number of econometric studies have found consistent evidence of a hump-shaped
relationship between income levels and pollution levels. According to this, as an economy grows
and income levels rise
A) initially the pollution levels remain low.
B) after a while, the pollution levels decrease.
C) the pollution levels also rise in proportion to the economic growth.
D) there is increasing industrialization, which leads to greater pollution.