What is the interpretation or explanation? Same pattern for the other future-dated contracts. This was around the time of the market halts.
https://techcrunch.com/2020/03/16/s...ps-circuit-breakers-due-to-coronavirus-scare/
Duh. They already converged, weird artifact of charting on different axes
Stochastic Trends and Cointegration in the Market for Equities
"A stock index and its futures price will be co-integrated if the cost of carry, or the difference between the dividend yield and interest rate, is stationary"
From the paper: " However, when the cost-of-carry is included in the cointegrating equation, the S&P 500 index and index futures prices are cointegrated. Thus, a finding of cointegration in equity markets depends critically on the cost of carry and, as suggested by a no-arbitrage pricing model, equity spot and futures markets are cointegrated."
and that "decoupling" is a "structural break" . Ahh yes, its all coming back to me now
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Should be interesting.