### Comment:
That's this part, which is more difficult to explain like he has an extra chromosome: 'The hedge funds and HFTs use this info to front run orders and take riskless arbitrage off unsuspecting suckers.' Rather than just copy/paste these writeups: 
  
 * [front running](https://www.investopedia.com/terms/f/frontrunning.asp) 
  
 * [riskless arbitrage](https://investinganswers.com/financial-dictionary/world-markets/arbitrage-2171)

### REPLY:
Thanks for sharing those links! Front running seems like it would be hard to do thesedays with most orders being filled almost instantly. Riskiest arbitrage seems like they are taking advantage of the cost difference rather than manipulating it themselves.

### END.