Sarah's Bargain Store, a perfect competitor, made an economic profit of $20,000.
A. She is operating in the short run.
B. She is operating in the long run.
C. She may be either in the short run or the long run.
D. There is no way to determine if she is operating in the short run or the long run.
A. She is operating in the short run.
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Which of the following equations for domestic absorption is correct?
A) a ? c + i + g + im B) a ? c + i + g + im - x C) a ? x - im D) a ? c + i + ca + im
Ellen is spending her entire income on goods X and Y. Her marginal utility from the last units of X and Y that she consumes is 25. Ellen's utility is only maximized if
A. the price of good X is twice that of good Y. B. the price of good Y is twice that of good X. C. the prices of X and Y are the same. D. We cannot determine whether Ellen is maximizing her utility.
Refer to the information provided in Figure 7.9 below to answer the question(s) that follow. 
Figure 7.9Refer to Figure 7.9. The slope of isocost AB is
A. -1. B. 0. C. 1. D. indeterminate from this information, as the prices of capital and labor are not given.
Under the system of "township planning"
a. no one could own land that had not been previously surveyed. b. settlers chose their own plots of land, under the supervision of a county surveyor. c. legal descriptions of property made reference to permanent natural objects. d. gaps between unsettled and settled land were encouraged.