The inevitable crash that will occur sooner or later could be one of the worsts crises since the 1929 crash, and perhaps since the burst of the South Sea Company bubble. What people fail to understand, is that the big tech mania is likely to lead to a massive funnel effect.
First, the level of concentration is at a record level as everyone is rushing to buy the same technology shares or large cap ETFs (see To Be Passive is to Let Others Decide for You). Second, short volatility bets are a big threat, as many investors (especially structured funds) believe that selling puts has become risk-free thanks to the “Fed put” (see Stranger Things). Last but not least, more and more traders are now buying short-term out of the money call options, forcing market makers to hedge their books buying index futures or stocks.
Needless to explain why this “concentration + short downside volatility + gamma squeeze” cocktail is highly explosive. When it reverses, or at least when the tech bull run stops, then you may expect a record volume to the downside. Everyone will become a seller of the same securities: retail traders, ETFs, options sellers, market makers, and every trend follower on Earth.