Today more and more automated trading systems are being used. There are many hedge funds who employ automated trading systems to dump millions of shares in the market with just one click. Automated trading system have reshaped the financial markets in a way which was not possible a few decades back. Today the financial markets are much more volatile as compared to four decades ago.
Super rich computers and advanced mathematical formulas have taken over the financial markets. After watching the above documentary, you should have a good idea how these automated trading systems can crash the markets in just a few minutes. Watch this documentary also on high frequency trading and what are quants.
When billions of dollars are placed at the disposal of these quants, you can well image how much power they start wielding on the market.