This is an... extraordinary article in the Wall Street Journal about stock internalization, etc.https://www.wsj.com/articles/exchanges-vie-with-ultrafast-traders-for-mom-and-pop-stock-orders-11568808000 …
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Thus the existence of market makers, including HFTs, who guarantee (for institutional investors) that if you want to sell 10k shares of Apple immediately for ~$2.2 million that you will be able to do this at a frictional cost so low that you'd assume I'm joking.
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