ASX Today, page-94

Definitely not paying the fees you and I have to pay per trade. I think it is all aimed at triggering "stops". Suppose you had equal buyers and sellers at 9.1c and 9.2c and the last trade was 9.2c. The automated trading system can initiate a small sell at 9.1c. Now that is the new price and if someone has a stop at 9.1c that will be triggered adding more sell pressure at 9.1c - which may match the entire buy line at 9.1c leaving buys at 9.0c and sells at 9.1c. Then all you need is another small sell at 9.0c and away you go again. Moral is - don't have automated trailing stops. Also be very careful buying or selling at open or close. That can also be manipulated but via another process.