Some illegal immigrants move back and forth across the U.S.-Mexican border. But in 2012, as many as _____ million immigrants were residing continuously in the U.S.

Suppose that a market for a product is in equilibrium at a price of $3 per unit. At any price below $3 per unit

A) there will be an excess demand for the product. B) the quantity demanded of the product will be less than the quantity supplied of that product. C) there will be a surplus of that product. D) there will be an excess supply of the product.

Less-developed countries are experiencing rapid population growth because _____

a. birthrates are rising at a slower rate than mortality rates b. birthrates are falling while mortality rates are rising c. both birthrates and mortality rates are falling d. birthrates are rising while mortality rates are falling e. birthrates are constant and mortality rates are rising