If you are trading based on research and conviction then this sort of predatory behavior should only minimal effect. I.e. if you think a company has good prospects for the future, then you probably expect the price of the stock to go up a significant percent. The sort of games described in the paper only alter the price by a small percent over a short period of time. Does it really matter if you buy the stock at 20.00 or 20.10 if you think the price is going to go up to 30.00?