Various people already noticed the megaphone structure in SPX
and the 7 1/2 Years (90bars) periodicity... Extrapolating these two points is a bit frightening since next low is supposed to be 600. In 2030 (YEP!) the SPX
is supposed to bounce back from 2900 being the 2.618 extension of the 2000 top 2009
low and the 1.618 extension
of the 2015 high and 2016 low... I really hope not!