Suppose Sam and Kevin can produce pens and pencils as shown in the table below. Pens Pencils Sam 12 hours 8 hours Kevin 4 hours 6 hours  Who has a comparative advantage in producing pens? Who has a comparative advantage in producing pencils? Suppose Sam and Kevin have to each give Flip, a common friend, 10 pens and 10 pencils. Is there a trade that will make both of them better off? If a trade that would make both of them better off exists, describe such a trade. If there is no such trade that would make both of them better off, explain why.