You're quite right in that mufu inflows are not all it takes, it also takes a market that is at least temporarily "sold out". Otherwise the inflows just spin their wheels.
The point is there are many dynamics which lead to rallies, including market liquidity. However the concept of some clandestine group lead by AG pumpin up the market on a daily basis is very high on my ludicrous scale and seems to be mainly supported by bears who I suspect are looking for a rational explanation as to why the market, after losing 50% of its value in 3 years, is actually bouncing.
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