In 2010, the poorest 20 percent of families in the United States population earned approximately ____ percent of the before-tax total income. (Fill in the blank.)

After the Civil War (1861–1865), the cotton South

(a) continued to experience prosperity. (b) was no longer the main contributor to the agricultural sector, as wheat production elsewhere began to prosper. (c) experienced prosperity in some Southern states but not in all. (d) was no longer the major source of income for the South; Southerners quickly supplemented their cotton incomes with income generated by the manufacturing sector.

Explain why a monopoly that knows the demand curve of identical consumers can set a two-part tariff with the lump sum tariff equal to the total amount of potential consumer surplus

What will be an ideal response?