That monthly reminder...pic.twitter.com/ZoPLqN3btH
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Yeah I think its for sP 500 or DJIA - you can learn more about it by googling "shiller PE" or "CAPE"
I don't think you can get any meaning out of doing it for sectors... retail vs tech vs pharmaceutical had different meanings 1920 vs today
But some crashes are a bit sector specific no? 2000 tech, 2007/8 finance. I don't mean track only tech for 100ys but...
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