If the United States, at the point where it is currently producing, must give up the production of 500 bicycles (B) to produce 20 additional tractors (T) with the same resources, its opportunity cost may be expressed as:

The age-earning cycle predicts that a typical person will

A) be earning $50,000 in the year 2010. B) be earning the lowest income right before retirement. C) be earning the highest income right before retirement. D) be earning the highest income at about the age 45-50.

Just before and during the recession of 2007-2009, net exports in the United States

A) fell and remained negative. B) fell, but remained positive. C) rose and became positive. D) rose, but remained negative.