Explicit costs are measured in dollars

When a country has a comparative advantage in producing a certain good,

a. the country should import that good. b. the country should produce just enough of that good for its own consumption. c. the country's opportunity cost of that good is high relative to other countries' opportunity costs of that same good. d. None of the above is correct.

The World Bank estimates that about ________ of the planet lives below $1.90 a day per person, and ________ lives on less than $3.10:

A. 13%; 50%. B. 35%; 50%. C. 1%; 35%. D. 13%; 35%.