Why does a tax in an efficient market decrease total surplus, while a tax in amarket with a negative externality increases total surplus?

Microeconomics
13th Edition
ISBN:9781337617406
Author:Roger A. Arnold
Publisher:Roger A. Arnold
Chapter17: Market Failure: Externalities, Public Goods, And Asymmetric Information
Section17.2: Internalizing Externalities
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Why does a tax in an efficient market decrease total surplus, while a tax in a
market with a negative externality increases total surplus?

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