Imagine that you own a mint-condition recording of Elvis
Presley’s first album. Because you are not an Elvis Presley fan you decide to
sell it. One way to do so is to hold an auction.
Four Elvis fans show up for your auction: john, George and
Ringo. Each of them would like to own the album but there is a limit to the
amount that each is willing to pay for it. Table the maximum pric that each of
the four possible buyers would pay. Each buyer’s maximum is called his willingness
to pay and it measures how much that buyer values the good. Each buyer would be
eager to buy the album at a price less than his willingness to pay and he would
refuse to buy the album at a price get rater than his willingness to pay. At a
price equal to his willingness to pay the buyer would be indifferent about
buying the good. If the price is exactly the same as the value he places on the
album he would be equally happy buying it or keeping his money.
To sell your album you begin the bidding at a low price. Because
all four buyers are willing to pay much more the price rises quickly. The bidding
stops when John bids. At this point Paul, George and Ringo have dropped out of
the bidding because they are unwilling to bid any more than. John pays you and
gets the album. Note that the album has gone to the buyer who values the album most highly.
What benefit does John receive from buying the Elvis Presley
album? In a sense John has found a real bargain. He is willing to pay $100 pay
for the album but pays only for it. We say that John receives consumers
surplus. Consumer surplus is the amount a buyer is willing to pay for a good
minus the amount the buyer actually pays for it.
Consumer surplus measures the benefit to buyers of
participating in a market. In this example John receives a $20 benefit from participating
in the auction because he pays only $80 for a good he values at $100. Paul,
George and Ringo get no consumer surplus from participating in the auction
because they left without the album and without paying anything.
Now consider a somewhat different example. Suppose that you
had two identical Elvis Presley albums to sell. Again you auction them off to
the four possible buyers. To keep things simple we assume that both albums are
to be sold for the same price and that no buyer is interested in buying more
than one album. Therefore the price rises until two buyers are left.
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