shares of power corp of canada pow shed 016 to c3636 tuesday in what proved to be an allaround poor trading session for the canadian market with the sptsx composite index gsptse falling 101 to 2040756 power corp of canada closed c133 short of its 52week high c3769 which the company achieved on may 5th trading volume of 16 m shares remained below its 50day average volume of 36 m