Shanique likes to make pots. She is a potter and she likes to dig her own clay for producing pots, cups and other ceramic items. She is aware of two places where she can obtain the right clay for her work. The first field is quite close, just at the edge of town. The second field is 15 miles away and (since there are no access roads) requires a half-day of travel just to get there. Compare the opportunity cost of producing pots using clay from each of these fields.