bullshit.
a big part of the assets the stock market is valuing is land/property. Banks lend out... mortgages... mcdonalds has... stores.
There was totally a land value bubble preceding the great depression.
Right now we have a land value bubble AND a nifty fifty style stock market bubble... but compare the dot com bust to the great recession. One was way more devastating than the other.
Right now, tech companies have very high pe ratios... BUT if and when those profits actually materialize, they will be capitalized into land values.
Even 10000 years from now, when civilization consists of a bunch of satellites orbiting the sun in a dyson swarm, an analogous orbit value tax will be the most logical source of tax revenue for a far future government.
Land is always a prequisite for doing business, and absent an LVT, private sector actors will benefit from the network effects inherent therein, instead of the community that that value was actually generated by.
What's your alternative to a LVT, a sales tax? A vat? Income tax? Deadweight loss, deadweight loss, deadweight loss.