An increase in the supply of money would decrease the interest rate and increase aggregate demand, other things equal

For direct price discrimination to work

a. The firm must be able to identify the members of the low value group b. The firm must charge a single price to all its customers c. The firm need not worry about any arbitrage since all its customers are charged the same price d. The firm should charge a higher price to those customers with the most elastic demand

Which of the following groups has the lowest life expectancy at birth?

a. middle-income economies b. low-income economies c. high-income economies d. sub-Saharan African economies e. all the world's economies