The Full Employment and Balanced Growth Act of 1978 set the target unemployment rate for the United States economy at 4 percent

Suppose a decrease in the supply of wheat results in an increase in revenue. This indicates that

A) the demand curve for wheat must be vertical. B) the resulting increase in price is proportionately greater than decrease in quantity sold. C) the decrease in quantity sold is proportionately larger than the resulting change in price. D) the supply curve for wheat must be vertical.

According to the research of economic historians, Southern farms

(a) realized the gains from regional specialization in the production of cotton, tobacco, sugar and rice. (b) used the gang system to increase the production of slaves. (c) were far larger, on average, than farms in the North. (d) were all of the above.