Compared to their percentage shares in 1968, over the next 40 years, the percentage shares of each of the lowest four quintiles

Which of the following is NOT a true statement?

A) Trade barriers are usually a good way of protecting jobs. B) There have been significant reductions in trade barriers over the last 60 years. C) Economists generally favor further reductions in trade barriers. D) There are diminishing returns to trade negotiations.

Economists use the phrase ceteris paribus to express the assumption

A. "everything affects everything else." B. "there is no such thing as a free lunch." C. "all else equal." D. "scarcity is a fact of life."