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Suppose that there is a negative externality in the market for bagels. The graph below shows the supply and demand curves for bagels.

Graphing window shows horizontal axis: 0 to 14, vertical axis: 0 to 14. Start Graph, Color red

xy
04
15
26
37
48
59
610
711
812
913
1014
1115
1216
1317
1418
Start Graph, Color blue
xy
08
17
26
35
44
53
62
71
80
9-1
10-2
11-3
12-4
13-5
14-6
Start Graph, Color green
xy
05
16
27
38
49
510
611
712
813
914
1015
1116
1217
1318
1419
Label "Quantity of bagels" at pixel coordinates (175,0).Label "Price of bagels" at pixel coordinates (0,170).Label "D (MPB)" at (1,8-1). Label "S (MPC)" at (1,4+1). Label "S (MSB)" at (5,5+1*5).

What is the market equilibrium quantity?

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What is the market price?

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What is the optimal (efficient) quantity?

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What should the government do in order to ensure the market produces the optimal (efficient) quantity?

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How big should the government's corrective taxes or subsidies be in this case?

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As a result of this negative externality, the market

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