Ooops, I stand corrected. thanks for clarifying.
Ales je blieft
I don't have a reference to attest the SPY (which is an ETF) is based off the S&P 500 Futures Contract (S&P Eminis /ES; and S&P Emicros)...
Dr Jon Najarian describes in his book how market makers make money. To make the market he will take a long side on one trade being offered and...
Under the "Markets" tab
https://finance.yahoo.com/calendar [ATTACH]
I'm not familiar with the IVV, but the SPY price mostly deviates slightly from the SPX Index because the SPY is based on the S&P500 Futures...
If you've placed a Put Spread and received a Credit for it, then that Credit is the most you can make on the trade; e.g. say I sold a $5 wide Put...
www.vixcentral.com is a good guide to show if monthly VIX Futures contracts are in contango or backwardation
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