High frequency trading, depending on the strategies used, has a different effect on the market condition. Some of them are draining liquidity from the market, другие – добавляют рынку ликвидность. Many of them are the cause of sudden unexpected movements in market quotations., and also generate new borderline methods of unethical, and sometimes illegal income generation on stock exchanges.
This controversial practice includes the method layering ( layering), the essence of which is to create the possibility of artificially shifting the quotations of purchases and sales of securities in order to force the rest of the exchange market participants to make a profitable deal for the manipulator.