If a supply curve has a constant slope throughout its length, it must have a constant price elasticity throughout its length

Bonnie can produce either 10 hats or 20 scarves in a month. Phil can produce either 10 hats or 5 scarves in a month. Therefore:

A) Phil has a comparative advantage in hats, Bonnie in scarves. B) Bonnie has a comparative advantage in hats, Phil in scarves. C) Phil has a comparative advantage in both hats and scarves. D) Bonnie has a comparative advantage in both hats and scarves. E) Neither of them has a comparative advantage in hats.

Because a monopoly ignores external costs, it is possible that it will

A) produce the socially optimal quantity of a good. B) produce more than the socially optimal quantity of a good. C) produce less than the socially optimal quantity of a good. D) All of the above.