RE:USA and USAS values and exchange rateIts called arbitrage if the diffence in price is to much between the US and Canada the traders will by on one exchange and sell on the other closing the spread and taking the profit. I did this a half a dozen time before the merger of USA and Scorpio ...eg. sell my USA shares and buy SPM shares at the same time knowing that its going to be one company. Managed to pick up just over 11,000 free shares (917 shares now) just off the spread.