Suppose there are two companies burning coal to generate electricity. The elect…

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Suppose there are two companies burning coal to generate electricity. The electricity generated is sold to the consumers, however coal burned generates a lot of smog pollution.

The marginal costs of abatement for both firms are:
MC1=10Q1MC_1=10Q_1 and MC2=3Q2+15MC_2=3Q_2+15

The government mandates both firms abate 4 units of pollution.

Is this an efficient / optimal?

If not, why?
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