Can you explicitly write out the sequence of events? Something like this, but obviously not so snarky:<p>1. Send a limit order for 1000@$20 to my brokerage. &lt;- This part I understand.<p>2. &quot;Lean on your bid?&quot; &lt;- Not a valid message in FIX.<p>3. Do flips. &lt;- Acrobats do this, not brokerages.<p>4. Make a profit