Major US Depression :

Started in 1837 but accelerated in 1839 and lasted till 1843.
    - 90 years- 
The #GreatDepression started in 1929 lasted till 1933.
   - 90 years- 
2019-2020 : ??
#Gann cycle : 90 years. We have googled abt cycle without going deep. 
#Nifty #stocks