Question

refer to figure 10 - 6. to internalize the externality in this market, what should the government do?
encourage firms to supply more of this product by offering tax incentives
produce the product itself
provide a subsidy for this product
impose a tax on this product

Explanation:

In this market, the social value curve (which accounts for positive externalities) is above the demand (private value) curve. When there are positive externalities, the market equilibrium quantity (\(Q_1\)) is less than the socially optimal quantity (\(Q_2\)). To internalize a positive externality (encourage more production/consumption to reach the socially optimal level), the government can provide a subsidy. A subsidy reduces the effective cost for producers or consumers, increasing the quantity supplied/demanded. Tax incentives for supply might not be as directly targeted as a subsidy. Producing the product itself is not the typical way to internalize an externality in a market - based approach for positive externalities shown here. Imposing a tax is for negative externalities (to reduce quantity).

Answer:

Provide a subsidy for this product