Empirical Studies Suggest That

Empirical studies suggest that

A) labor productivity has declined throughout U.S. history.
B) technological advances account for about 40 percent of U.S. productivity growth.
C) achieving economies of scale is the most important factor in U.S. economic growth.
D) all U.S. economic growth from between 2001 and 2007 can be attributed to increases in the quantity of labor.