This is just some food for thought. The volume over the past two years since the major stock indexes found a low in March 2009 has been exceptionally very light. This past January (2011) the trading volume was lighter than it was in August 2010 which is historically the lighter volume month of the year. Where has all the volume gone? High frequency trading accounts for the majority of the daily trading volume right now. If you ever traded or followed Citigroup Inc. (NYSE:C) you would know that the average volume for this stock is around 490 million share a day. This stock is rumored to have a 10 for 1 reverse split scheduled soon. What is going to happen to the volume in this market after that reverse split? Logic tells us that the overall trading volume will get significantly lighter for the markets.