Table 19-1 Source: US Census Bureau and Mankiw's Calculations
-Refer to Table

Table 19-1
$$\begin{array} { | l | l | l | } \hline& \mathbf { 1 9 7 5 } & \mathbf { 2 0 1 1 }\\ \hline \text { Men } & \\\hline \text { High school, no college } & \$ 48,720 &\$46,038 \\\hline \text { College graduates } & \$ 69,146 & \$ 80,508 \\\hline \text { Percent extra for college grads } & + 42 \% & + 75 \% \\\hline & & \\\hline \text { Women } & & \\\hline \text { High school, no college } & \$ 28,006 & \$ 32,249 \\\hline \text { College graduates } & \$ 37,804 & \$ 58,229 \\\hline \text { Percent extra for college grads } & + 35 \% & + 81 \% \\\hline\end{array}$$ Source: US Census Bureau and Mankiw's calculations
-Refer to Table 19-1. What are two possible hypotheses to explain the changes in relative demand for high-skilled workers and low-skilled workers in recent years?