There are a lot of documentaries freely available on YouTube.
Sometimes the producers release them for free, but most often other people upload the films and the copyright owners don't bother with taking them down.
xDocumentaries is a central place where you can easily find these documentaries...
A 2013 episode of the VPRO Backlight documentary program about high-frequency trading on Wall Street and a trading algorithm builder who discovered the system was rigged to favor algorithms from insiders and started talking publicly about it.
Most trade on Wall Street is not done by humans...(show more)