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The tech bubble was the most prominent "stock up, vol up" event at the index level the market has experienced. It was empowered by a dramatic shift towards tech in the composition of the index and the high realized vol that came with it.

stock to stock correlation was much higher back then. a second notable difference is stock to bond correlation. in 2011, "risk on/risk off" was in full swing and 10y yields fell by about 150bps. This year, they have risen by roughly the same. 