6- How does the United States compare to other advanced, industrialized economies on the issue of openness? a. The U.S. economy is completely closed. b. The U.S. economy is at the low end of openness. c. The U.S. economy is above average in openness. d. The U.S. economy is among the most open. e. The U.S. economy is the most open of any economy. Figure 4-11