Online discount brokerage TD Ameritrade (AMTD) said daily trade volume fell 10% in November from a year ago, but was up 3% from October. Part of the slowdown was blamed on Hurricane Sandy, which devastated parts of New York and New Jersey in the final days of October. The company said it made an average of 341,000 client trades per day in November. The $475.1 billion in client assets it held were up 18% from a year ago, and 1% from the previous