2.1 Positive Externality Fish farms in Upcity feed their fish on the river, which also feeds Trouts caught by fishers in Downton. In that sense, amount of feeds provides a positive externality to Downton by 50$ per ton of raising their fish. What would be the equilibrium price and quantity in the Salmon market? What would be the socially optimal price and quantity of Salmon if the positive externality to Downton is accounted for?

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