The case for deception in markets is an interesting one, but for several reasons I hypothesize that what we are seeing may be self-deception:

Deception on such a large scale would imply that some kind of collusion is involved by market participants as no one source of participants is large enough to move a liquid market.
Let’s say that last time there was a particular memorable event a related market moved sharply in a particular direction. Those who were stung the previous occasion are likely to liquidate their positions on the basis of ‘once bitten, twice shy’. Thus they move the market in the opposite direction to last time prior to the event in question.


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