I 16) For the U.S. economy after WWII: in terms of "taming" the business cycle and providing for long-run prosperity, has Keynesian economics been successful? By what measure? 17) Please explain how the economic concentration of U.S. firms changed during the second half of the 20th century, using statistics. 18) What happened to trends in poverty and/or inequality during the late 20th century and to the present? 3