If a firm sells 50 units of output at $9 per unit and 60 units of output when price is reduced to $8, its marginal revenue from selling the sixth unit is
A. $30.
B. $450.
C. $10.
D. $480.
Answer: A
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A) once; once B) once; twice C) twice; once D) twice; twice
The marginal propensity to save (MPS) is
A) the rate at which real savings changes over time. B) the percentage of real disposable income saved. C) the difference between the amounts of real disposable income consumed and saved. D) the percentage of an additional dollar of real disposable income that will go toward additional real savings.
When a customer deposits $100 into a checking account, it: a. increases the bank's liabilities only
b. decreases the bank's liabilities only. c. increases the bank's assets only. d. decreases both the bank's liabilities and its assets. e. increases both the bank's liabilities and its assets.
In Figure 35.1, if rents are uncontrolled, then the amount that renters will want will be 
Figure 35.1
A. Q*. B. Q'. C. 0. D. Q".