NSE’s co-location feature destroyed the market for Retail Day traders

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Sree Iyer does a step-by-step explanation of how co-location can harm the retail stock investor and the Mutual Fund community, by using simple examples. NSE did not have SEBI’s permission before starting HFT & co-location in Jan 2010. Does this mean that all trades using co-location are illegal? Was SEBI told to look the other way? If yes, who told them? A must-watch!