On average, collective bargaining increases wages

The opportunity cost of moving from point a to point b in the above figure is ________

A) zero B) 3/2 pairs of socks per sweater C) 3 pairs of socks D) 2 sweaters

To be classified as a low-income developing country, annual per capita income in 2010 needed to be:

A. $1,005 or less. B. $580 or less. C. $3,723 or less. D. $925 or less.