The revealed comparative advantage is an index used in international economics for calculating the relative advantage or disadvantage of a certain country in a certain class of goods or services as evidenced by trade flows. It is based on the Ricardian comparative advantage concept. It most commonly refers to an index introduced by Béla Balassa (...
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http://en.wikipedia.org/wiki/Revealed_comparative_advantage
Balassa's (1965) measure of relative export performance by country and industry, defined as a country's share of world exports of a good divided by its share of total world exports. The index for country i good j is RCAij = 100(Xij /Xwj)/(Xit /Xwt) where Xab is exports by country a (w=world) of good b (t=total for all goods).
Found on
http://www-personal.umich.edu/~alandear/glossary/
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