$NYSI daily over several years along with the plot of SPY daily price closes --
* what took place in 1st half of 2018 & 4th quarter 2018 and in January to March 2020? when $NYSI was declining like it has been doing in second half of August and in September 2020, so far, in advance of the SPY price action actually turning down until many weeks after the $NYSI decline was well underway for several weeks/months in early 2018 and 3rd/4th quarter 2018 and in early 2020?
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