Answer:
$5 million
Step-by-step explanation:
If we follow the Coase Theorem, the appropriate solution to this case should be obtained regardless of initial rights. In this case, the factory saves $5 million to the producer, but it costs $10 million to Boston residents. if Boston residents pay $5 million or more to the factory owner, then both would benefit. Boston residents will gain $10 - $5 = $5 million, as well as the factory owner.