That sounds like a one-time thing. Once things stabilize you wouldn't see a big fluctuation every time a CEO has to pay taxes.
Also normal people and the mildly rich and retirement funds and many other big sources of ownership wouldn't be taxed, so I don't see prices actually crashing.
>That sounds like a one-time thing.
Repeatedly pushing the "destroy the world economy" multiple times per day is most likely not going to be a "one-time thing". But who knows... maybe you're right and economics doesn't work like it has been documented to work by the world's experts for the last 100 years or so.