It has been called the rise of the machines - automated share market trading which allows some investors to make quick profits but also makes volatility worse.
Algorithmic or automated trading is under the spotlight particularly in the United States.
Earlier in the year investment firm Knight Capital almost went under because of a trading glitch, and in 2010 there was a flash crash on Wall Street where the major share indices tumbled dramatically before rebounding minutes later.
Now the Federal Government is tightening up the share market rules in Australia to address the issue.
"We want to make sure that there's a level playing field, in terms of regulation, for all users engaging in trading of shares," said Financial Services and Superannuation Minister, Bill Shorten.