The airline and trucking industries are two examples of industries that were regulated because they were natural monopolies
Indicate whether the statement is true or false
FALSE
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Based on the figure below. Starting from long-run equilibrium at point C, a tax cut that increases aggregate demand from AD to AD1 will lead to a short-run equilibrium at point ________ and eventually to a long-run equilibrium at point ________, if left to self-correcting tendencies. 
A. D; C B. B; C C. B; A D. D; B
The variance of the slope estimator increases as the error variance decreases.
Answer the following statement true (T) or false (F)
In the short run, a monopolistically competitive firm can earn
A. zero, positive or negative profits. B. positive profits only. C. zero profits only. D. zero or positive profits only.
Refer to the figure. Suppose the graphs represent the demand for use of a local golf course for which there is no significant competition (it has a local monopoly); P denotes the price of a round of golf; Q is the quantity of rounds "sold" each day. If the left graph represents the demand during weekdays and the right graph the weekend demand, this profit-maximizing golf course should:
A. charge $9 for each round, regardless of the day of the week.
B. charge $7 for each round, regardless of the day of the week.
C. charge $7 for each round on weekdays and $10 during the weekend.
D. charge $9 for each round on weekdays and $10 during the weekend.