article in australian investment review reits, page-10

Algorithmic Trading
What Does Algorithmic Trading Mean?
A trading system that utilizes very advanced mathematical models for making transaction decisions in the financial markets. The strict rules built into the model attempt to determine the optimal time for an order to be placed that will cause the least amount of impact on a stock's price. Large blocks of shares are usually purchased by dividing the large share block into smaller lots and allowing the complex algorithms to decide when the smaller blocks are to be purchased. Investopedia explains Algorithmic Trading
The use of algorithmic trading is most commonly used by large institutional investors due to the large amount of shares they purchase everyday.

Complex algorithms allow these investors to obtain the best possible price without significantly affecting the stock's price and increasing purchasing costs.

The last paragraph will show that the trading tries not to affect the price. This shows why CER can hover around the traders best possible price of the 9c to 10c range.

The description also should explain why the small trader paying full brokerage on every trade can not compete with the alorithmic traders. It will also show the reason for the large number of bot trades on CER at times.