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part-time opportunists couldn’t swoop in



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[N. Gregory(N. Gregory Mankiw) Mankiw] Principles (BookFi)


part-time opportunists couldn’t swoop in
to steal regular customers from a long-
term operator. But to encourage compe-
tition, at other corners along the route
there should also be common stops
where passengers could be picked up by
any licensed jitney or bus.
Elements of this system already ex-
ist where jitneys have informally estab-
lished their own stops separate from the
regular buses, but the City Council is try-
ing to eliminate these competitors. Be-
sides denying licenses to new drivers
like Cummins, the Council has forbidden
veteran drivers with licenses to operate
on bus routes. Unless these restrictions
are overturned in court—a suit on the
drivers’ behalf has been filed by the Insti-
tute for Justice, a public-interest law firm
in Washington—the vans can compete
only by breaking the law. At this very mo-
ment, despite the best efforts of the po-
lice and the Transport Workers Union,
somewhere in New York a serial preda-
tor like Cummins is luring another unsus-
pecting victim. He may even be making
change for a $5 bill.
S
OURCE
:
The New York Times Magazine,
August 10,
1997, p. 22.


3 3 6
PA R T F I V E
F I R M B E H AV I O R A N D T H E O R G A N I Z AT I O N O F I N D U S T R Y
P R I C E D I S C R I M I N AT I O N
So far we have been assuming that the monopoly firm charges the same price to all
customers. Yet in many cases firms try to sell the same good to different customers
for different prices, even though the costs of producing for the two customers are
the same. This practice is called 
price discrimination.
Before discussing the behavior of a price-discriminating monopolist, we
should note that price discrimination is not possible when a good is sold in a com-
petitive market. In a competitive market, there are many firms selling the same
good at the market price. No firm is willing to charge a lower price to any cus-
tomer because the firm can sell all it wants at the market price. And if any firm
tried to charge a higher price to a customer, that customer would buy from another
firm. For a firm to price discriminate, it must have some market power.
A PA R A B L E A B O U T P R I C I N G
To understand why a monopolist would want to price discriminate, let’s consider
a simple example. Imagine that you are the president of Readalot Publishing Com-
pany. Readalot’s best-selling author has just written her latest novel. To keep
things simple, let’s imagine that you pay the author a flat $2 million for the exclu-
sive rights to publish the book. Let’s also assume that the cost of printing the book
is zero. Readalot’s profit, therefore, is the revenue it gets from selling the book mi-
nus the $2 million it has paid to the author. Given these assumptions, how would
you, as Readalot’s president, decide what price to charge for the book?
Your first step in setting the price is to estimate what the demand for the book
is likely to be. Readalot’s marketing department tells you that the book will attract
two types of readers. The book will appeal to the author’s 100,000 die-hard fans.
These fans will be willing to pay as much as $30 for the book. In addition, the book
will appeal to about 400,000 less enthusiastic readers who will be willing to pay up
to $5 for the book.
What price maximizes Readalot’s profit? There are two natural prices to con-
sider: $30 is the highest price Readalot can charge and still get the 100,000 die-hard
fans, and $5 is the highest price it can charge and still get the entire market of
500,000 potential readers. It is a matter of simple arithmetic to solve Readalot’s
problem. At a price of $30, Readalot sells 100,000 copies, has revenue of $3 million,
and makes profit of $1 million. At a price of $5, it sells 500,000 copies, has revenue
of $2.5 million, and makes profit of $500,000. Thus, Readalot maximizes profit by
charging $30 and forgoing the opportunity to sell to the 400,000 less enthusiastic
readers.
Notice that Readalot’s decision causes a deadweight loss. There are 400,000
readers willing to pay $5 for the book, and the marginal cost of providing it to
them is zero. Thus, $2 million of total surplus is lost when Readalot charges the
higher price. This deadweight loss is the usual inefficiency that arises whenever a
monopolist charges a price above marginal cost.
Now suppose that Readalot’s marketing department makes an important dis-
covery: These two groups of readers are in separate markets. All the die-hard fans
live in Australia, and all the other readers live in the United States. Moreover, it is
p r i c e d i s c r i m i n a t i o n

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