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A comment on At Blackrock, machines are rising over managers to pick stocks. Parent comment

Re:At Blackrock, machines are rising over managers to pick s... by jnordwick on Sunday April 02, 2017 @09:49PM (#14020116)
You can actually arb the SP500 components against the ETFs like SPY in a process that creates and redeems the ETF. This is how the ETF is kept in line.
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