A firm producing cans buys three tons of aluminum per day at $200 per ton. If it buys four tons per day, it receives a quantity discount on all units and pays only $175 per ton. The marginal cost of the fourth ton per day is
a. $100.
b. $175.
c. $700.
d. $225.
A
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Strategic behavior is the result of an interdependent world
Indicate whether the statement is true or false
Where interdependence is especially pronounced, competition among oligopolists will
A. resemble military tactics and strategies. B. disappear. C. lead to large increases in product output. D. entice more firms to enter the market.
Assume that an individual consumes two goods, X and Y. The total utility (assumed measurable) of each good is independent of the rate of consumption of other goods. The prices of X and Y are, respectively, $5 and $10. 
Given the above, if the consumer buys the third unit of Y,
A. the marginal utility of the third unit is 950 units of satisfaction. B. the marginal utility per dollar spent on Y is 20. C. the marginal utility per dollar spent on Y is 200. D. both a and b.
In a country with a working-age population of 200 million, 140 million people are employed and 20 million are unemployed. The size of the labor force is
What will be an ideal response?