The price of the polycarbonate is determined based on either of the two parameters: Based on the monomer contract price P (PC) = monthly contract price for feedstock + fixed component + premium Based on the index price P (PC) = Resin price quoted in the index for the month [CMAI/CDI/Platts] +/- margin% Another formula that calculates polycarbonate price is: P (PC) = Resin index price for the month + Conversion cost + Margin