Gammon's presentation is the theory is that ETFs are forced to sell the shareholdings, and the potential "buyers" know that so there is no point bidding above 0. (or perhaps 0.1 but nominal 0).
And most of George's stuff is gathered from the work of others and presented.
Admittedly I'm only generally interested in the topic so I don't have deep knowledge.
When people start selling S&P ETFs, which make up 50% or more of S&P holdings, the offers will tend to zero.
This is because the people selling have to sell on instruction.
George Gammon explains how the whole thing could come down
https://www.youtube.com/watch?v=2Y8k73E1K4A
Gammon's presentation is the theory is that ETFs are forced to sell the shareholdings, and the potential "buyers" know that so there is no point bidding above 0. (or perhaps 0.1 but nominal 0).
And most of George's stuff is gathered from the work of others and presented.
Admittedly I'm only generally interested in the topic so I don't have deep knowledge.