In a perfectly competitive market, a firm's short-run supply curve is
A) its total cost curve.
B) its marginal cost curve equal to or above the point of intersection with its average variable cost curve.
C) its average variable cost curve below the point of intersection with its total cost curve.
D) its total cost curve between the shutdown point and the break-even point.
Answer: B
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Starting from long-run equilibrium, an increase in autonomous investment results in ________ output in the short run and ________ output in the long run.
A. lower; potential B. higher; higher C. lower; higher D. higher; potential
Happy Bagels sells its bagels for $6 each and the firm has a constant marginal cost of $4 per bagel, which is equal to its (constant) average total cost. If Happy Bagels does not sell a bagel the day it is produced, the bagel is sold as day-old for $2. If Happy Bagels is currently holding 50 bagels in inventory and the probability that Happy Bagels will sell 50 bagels or more is 0.40, which of
the following statements is true? A) To obtain the profit-maximizing, optimal level of inventory, Happy Bagels needs to double its inventory. B) To obtain the profit-maximizing, optimal level of inventory, Happy Bagels needs to increase its inventory. C) To obtain the profit-maximizing, optimal level of inventory, Happy Bagels needs to decrease its inventory. D) Happy Bagels is holding the profit-maximizing, optimal level of inventory.
The response in quantity demanded to a price increase in subway rides:
A. will be more elastic in six weeks than in six months. B. will be less elastic in six weeks than in six months. C. will be the same over that time period. D. is unpredictable without more information.
Professor's economics students are constructing models for how gasoline prices change. Maria's model has very realistic assumptions and is quite complex. Anna's model is less complicated and less realistic. Maria's model correctly predicts gas price increases 5% of the time. Anna's model predicts correctly 15% of the time. On the basis of usefulness or "goodness," Professor will give which student's model the higher grade and why?
A. Maria's model gets the higher grade because it is more realistic. B. Anna's model gets the higher grade because it predicts accurately more often. C. Maria's model gets the higher grade because it is more complex. D. Anna's model gets the higher grade because it is simpler.