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211.Aleks owns a small factory and he has determined that when he employs eight workers that total

production is 80 units of output, and when he employs nine workers, production increases to 81 units of

output. Based on this information, we can tell that when nine workers are employed, the marginal product of the ninth worker is ___________ and the average product of labor is ____________.

(A) 10 units; 9 units

(B) 1 unit; 81 units

(C) 1 unit; 9 units

(D) 80 units; 9 units

(E) 1 unit; 8 units

212.Which of the following statements are correct about short-run production functions?

I. When the total product of labor is increasing, the marginal product of labor is negative.

II. When the marginal product of labor is greater than the average product of labor, average

product of labor is rising.

III. When the marginal product of labor is falling, the total product of labor is also falling.

(A) I only

(B) II only

(C) III only

(D) II and III only

(E) I, II, and III

213.Short-run cost curves are drawn in Figure 8.1. What function does Curve Y represent in the graph?

(A) Total fixed cost

(B) Total cost

(C) Average total cost

(D) Total variable cost

(E) Marginal cost

214.Short-run cost curves are drawn in Figure 8.1. What function does Curve X represent in the graph?

(A) Total cost is the sum of total variable cost and marginal cost.

(B) Total cost is the difference between total variable cost and total fixed cost.

(C) Total cost is the sum of average variable cost and average fixed cost.

(D) Total cost is the sum of average variable cost and marginal cost.

(E) Total cost is the sum of total variable cost and total fixed cost.

215.In this short run, which of the following is an accurate description of how to calculate total cost?

(A) Total cost is the sum of total variable cost and marginal cost.

(B) Total cost is the difference between total variable cost and total fixed cost.

(C) Total cost is the sum of average variable cost and average fixed cost.

(D) Total cost is the sum of average variable cost and marginal cost.

(E) Total cost is the sum of total variable cost and total fixed cost.