Do market makers in practice really hedge SPX and ES options in SPY or does the reverse occur often?
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Wonder if value traded here is a good metric. The reason being the true metric for setting price is the price impact, which I'm guessing differs per share/unit on ES/SPY.
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No, they would have the same price impact (for a large enough order) since the mkt maker can hedge their SPY position with ES or vice versa — they are very closely related markets!
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