Between 1950 and 2013, the productivity of wheat farmers in the United States more than doubled. This means that
A) the amount of land and other resources devoted to wheat production more than doubled.
B) the incomes of wheat farmers more than doubled.
C) the total amount of wheat produced more than doubled.
D) the amount of wheat produced by the average farmer more than doubled.

Question

Quizplus · Accepted Answer

Productivity refers to the amount of output produced per input unit, in this case, the amount of wheat produced per farmer. Therefore, the productivity of wheat farmers doubling means that the amount of wheat produced by the average farmer more than doubled.

Between 1950 and 2013, the Productivity of Wheat Farmers in the United