Which public policy is best suited to promote a positive externality?

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Prohibit the product responsible for the externalityImpose a tax on the productProvide financial support or subsidies for the productHave the government manufacture the product until the marginal benefit equals zero

Explanation

To encourage a positive externality, the government should subsidize the good to increase its consumption. Banning or taxing the good would reduce its use, which is counterproductive. Government production until marginal value is zero is inefficient and unnecessary.