For example, the whole premise of the book was that banks would see 10,000 shares offered on 5 different exchanges. They'd go to buy 10,000, but only get filled on 2,000, and then cry foul. But people don't normally think like this. For example, if I wanted to sell my bike. I list it on Craigslist, Facebook and Next Door. If someone simultaneously contacted me through all three platforms, no one would expect that I was responsible for selling three bikes. Now, replace "bike" with "2,000 shares."