The saving rate.
Answer to Problem 1QQ
Option (a) is the correct answer.
Explanation of Solution
Option (a):
The production function is given as
Option (b):
With the given production function, the income of the person grows when the saving rate exceeds 8 percent. However, this is not the minimum value for this condition. Thus, option (b) is incorrect.
Option (c):
With the given production function, the income of the person grows when the saving rate exceeds 10 percent. However, this is not the minimum value for this condition. Thus, option (c) is incorrect.
Option (d):
With the given production function, the income of the person grows when the saving rate exceeds 12 percent. However, this is not the minimum value for this condition. Thus option (d) is incorrect.
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