Question

How to calculate the opportunity cost?

Answer 1

Opportunity cost is the second best alternative we forego when making a choice.
If you have 2 options, with a worth on each, e.g.

Chicken = 2
Fish = 4
and you forego chicken,
you divide 4 by 2 = 2

... however, if there is no value on such items, then you cannot calculate it.

Look more at comparative advantage.

Answer 2

http://new.ipfw.edu/dotAsset/142427.pdf Hope this site helps you