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

What is the market equilibrium quantity?

What is the market price?

What is the optimal quantity?

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

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

As a result of the positive externality, this market