经济学原理 曼昆课后答案 chapter.doc

. .
优选
Problems and Applications
1. If an early freeze in California sours the lemon crop, the sups from $4 to $2, Bert buys three bottles of water, an increase of one. His consumer surplus consists of both areas A and B in the figure, an increase in the amount of area B. He gets consumer surplus of $5 from the first bottle ($7 value minus $2 price), $3 from the second bottle ($5 value minus $2 price), and $1 from the third bottle ($3 value minus $2 price), for a total consumer surplus of $9. Thus consumer surplus rises by $5 (which is the size of area B) when the price of a bottle of water falls from $4 to $2.
. .
优选
4. a. Ernie’s supply schedule for water is:
Price
Quantity Supplied
More than $7
4
$5 to $7
3
$3 to $5
2
$1 to $3
1
Less than $1
0
Ernie’s supply curve is shown in Figure 7-10.
Figure 7-10
b. When the price of a bottle of water is $4, Ernie sells two bottles of water. His producer surplus is shown as area A in the figure. He receives $4 for his first bottle of water, but it costs only $1 to produce, so Ernie has producer surplus of $3. He also receives $4 for his second bottle of water, which costs $3 to produce, so he has producer surplus of $1. Thus Ernie’s total producer surplus is $3 + $1 = $4, which is the area of A in the figure.
c. When the price of a bottle of water rises from $4 to $6, Ern