Which type of tariff is forbidden in the United States on Constitutional grounds?

To satisfy the admission criteria to the European Union, a country must meet all of the following, EXCEPT:

A) maintain an inflation that is equal to the average of the three lowest rates. B) maintain long-term interest rates equal to that of the three countries with the lowest inflation rates. C) maintain a pegged exchange rate, without any revision for two years. D) cut down taxes to the lowest possible level.

If the poorest 80 percent of the population receives 75 percent of the income, then the

a. richest quintile receives 20 percent of the income b. Lorenz curve lies on the diagonal c. richest quintile receives 25 percent of the income d. poorest quintile receives 25 percent of income e. poorest quintile receives 75 percent of the income