The ratio is a BM&F product that represents the Ibovespa theoretical “book”
In its maturity.These contracts are based in the ratio of the profitability of the stock exchange that correspond to a hypothetical share “ book “ To operate the ratio is operates with the “ the market book “.
This ratio measures the profitability of the negotiated shares in the Ibovespa and represents the well- considered average of the prices of these shares with bigger representation in the money volume negotiated in the last months.