The above figure shows the marginal benefits and marginal costs of a college education. If no subsidies are paid, colleges charge tuition of

Which of the following is the best explanation for why the price of gasoline increases during the summer months?

A) Oil producers have higher costs of production in the summer. B) Sellers have to earn profits during the summer to cover losses in the winter. C) There is increased driving by families going on vacation. D) There is less competition among oil refineries in the summer. E) The number of gas stations open 24 hours a day rises in the summer months and so the price must rise to cover the higher costs.

The productivity of the employees of a bakery is reduced because of the excessive noise coming from a next door car repair shop. This is an example of

A) synergy. B) a positive externality. C) a negative externality. D) happy coexistence.