A positive externality causes the marginal social benefit to exceed the marginal private cost of the last unit produced. the marginal private benefit to exceed the marginal social cost of the last unit produced. the marginal social benefit to be equal to the marginal private cost of the last unit produced. the marginal social benefit to be less than the marginal private cost of the last unit produced.

Which of the following best explains the purpose of protectionist trade policies such as tariffs and subsidies? a. they make sure that governments have enough money to pay for fiscal policies. b. they give foreign competitors access to new markets around the world. c. they allow producers to sell their products more cheaply than foreign competitors. d. they enable producers to purchase productive resources from everywhere in the world.