A 10 percent increase in income increases the quantity of apple juice demanded from 18,800 to 21,200 gallons. The income elasticity of demand for apple juice is

Suppose that in 2015 a country has a population of 1 million and real GDP of $1 billion. In 2016, the population is 1.1 million and the real GDP is $1.1 billion. The real GDP per person growth rate is

A) $1000. B) positive. C) negative. D) zero.

When the marginal product curve is downward sloping, the average product curve

A) must also be downward sloping. B) might be either upward or downward sloping. C) must be upward sloping. D) must be horizontal.