Faster players can actually profit off you both when using a market order or when using a limit order. Interestingly, for small retail trades in liquid stocks, using a market order can be better as the internalizer software classes you as &quot;dumb retail&quot;, giving you the best fill (as they need to make their 605 reports look good).<p>An excellent explainer can be found at <a href="http:&#x2F;&#x2F;www.nanex.net&#x2F;aqck2&#x2F;What-Every-Retail-Investor-Needs-to-Know.pdf" rel="nofollow">http:&#x2F;&#x2F;www.nanex.net&#x2F;aqck2&#x2F;What-Every-Retail-Investor-Needs-...</a>