When the U.S. economy expands, foreign investment in and immigration to the U.S. usually contracts

In general, the term "ceteris paribus" means

A. all else equal B. holding everything else variable C. unsettled mathematical paradigms D. Both A and B

In 2012, the top one-fifth of U.S. households earned ________ of the nations total income

A) about 22% B) just under 35% C) just over half D) almost 90%