Maria wishes to buy gasoline and have her car washed. She finds that if she buys 9 gallons of gasoline at $2.50 per gallon, the car wash costs $2, but if she buys 10 gallons of gasoline, the car wash is free. For Maria, the marginal cost of the tenth gallon of gasoline is
A) $2.50.
B) zero.
C) $2.00.
D) 50 cents.
D) 50 cents.
Economics
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The present value of $100 to be received in a year is
A) less than $100 and falls as the interest rate rises. B) less than $100 and rises as the interest rate rises. C) more than $100 and falls as the interest rate rises. D) more than $100 and rises as the interest rate rises.
Economics
Short-run demand for electricity can be quite elastic because consumers can change when they consume electricity
Indicate whether the statement is true or false
Economics
Describe the major types of unemployment.
What will be an ideal response?
Economics
Referring to the Aggregate Demand - Aggregate Supply diagram in Figure 8.1, which box should be filled with the label AS for the aggregate supply curve? 
A. Box 1 B. Box 2 C. Box 3 D. Box 4
Economics