If an analyst believes that more than one explanatory variable explains the variation in the dependent variable, what model should be used?
A. a simple linear regression model
B. a log-linear model
C. a nonlinear regression model
D. a multiple regression model
Answer: D
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In the short run, if average product is at its maximum, then average variable cost is at its minimum
Indicate whether the statement is true or false
Which of the following belongs to the government regulation to control pollution?
A) emissions standard B) emissions fee C) effluent charge D) All of the above
With an upward-sloping supply curve, which of the following is true?
a. An increase in price results in a decrease in quantity supplied. b. An increase in price results in an increase in supply. c. A decrease in price results in a decrease in quantity supplied. d. A decrease in price results in an increase in supply.
Suppose the figure below illustrates the demand curve facing a monopolist. 
At a price of $8 per unit, the total revenue for this monopolist is ________ per day, and the marginal revenue earned from the last unit sold is ________.
A. $3,200; $8 B. $3,200; $0 C. $3,200; $4 D. $8; $8