Regulating the markets

There is no way out but regulating the markets.
IMO the most needed and effective step would be to limit high-freq-trading (HFT).
Between entering a trade (x shares) and closing the same trade there should be
a time difference of about 10 to 30 seconds allowed.
Otherwise the whole system will explode one day.

 

Or implement a 1/4 cent per share tax. That would close them down for good!