There have been about 10 recessions after 1950. While observing the recent two, each one started after a trigger. 2008 - Mortgage Crisis and 1997 - dot com.
I understand that a recession is not a result of an isolated event. But does every recession necessarily start with some big shock followed by snowball effect? If so, are there educated guesses on what could potentially lead to the next one? (like cryptocurrencies or Carl Icahn's recent warning on index funds?)