Economics 104B
Old Midterm Exam and Solutions
1. Assume that the taxi industry in New York city is competitive. Also assume that the
marginal cost of a taxi ride is constant and equal to $5 per trip and that each taxi
is capable of making 20 trips a day. Let the demand function for taxi rides each day
be
D
(
p
) = 1100

20
p
.
a. (5pt) Find the daily competitive equilibrium price of a taxi ride.
Answer:
Notice (i) entry or exit is free; (ii) marginal cost and average cost are
the same; and (iii) all taxis are identical. We have in competitive equilibrium,
price
p
*
=
MC
= $5.
b. (2pt) How many rides will the citizens of New York make each day?
Answer:
Price
p
*
found in part (a) together with the demand function,
Q
*
=
D
(
p
*
) = 1100

20
p
*
= 1000 is the total number of rides in equilibrium. So, the
number of rides that citizens of New York City will make each day is 1000.
c. (2pt) How many taxis will operate in New York?
Answer:
Since taxis are identical and each taxi can make 20 trips a day, the
number of taxis is given by 1000
/
20 = 50
.
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 Spring '10
 Staff
 Economics, Monopoly, Supply And Demand, competitive equilibrium price

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