One month ago, shortly after our return to twitter from "permanent" banishment, when so much public attention had suddenly shifted to the retail daytrading platform Robinhood, we explained just how it is that Robinhood was so efficient at moving markets, and it had nothing to do with Robinhood or its small but dedicated army of 10-year-old daytrading fanatics. Instead, it had everything to do with various High Frequency Trading platforms buying up the retail orderflow that Robinhood was so generously packaging and reselling to the highest bidder, effectively giving HFTs a risk-free way of making pennies from every ... (full story)