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You're right that they aren't speculative in the financial sense of "hopefully gaining value over time", but you do speculate (in the more general sense) on the fiat-pegging mechanism(s) to work to preserve the value you are storing in them...
E.g.
* Offshore oil drilling
* Tech companies
* Fully remote CPAs
* Electricians
* etc
It seems very weird large sections of the economy become virtually untaxed, requiring a MASSIVE tax burden on the others. The simplicity of the LVT plan kinda hides that it implies a huge restructuring of the economy.
> An LVT discourages searching for new uses of land
> An LVT implicitly taxes improvements to nearby land
If I find oil on my land, or if someone builds a park across the street from me, then I should be taxed more. The land is more valuable to me! At a 100% LVT I essentially break even. Anything less then that, and I still come out on top.
The only valid arguments in here are the last two. If people buy a piece of property with certain assumptions and the government turns around implements a 100% LVT, then I can understand why they would be upset.
So sure, there are some practical considerations to implementing a 100% LVT immediately tomorrow with no exemptions, and it probably wouldn't raise enough revenue to eliminate all other taxes. But the government could still raise a ton of tax revenue with minimal deadweight loss by phasing in a 75% LVT over 30 years with a handful of common sense exemptions.
It's certainly a way to keep the network secure. At best it's marginally better than POS. At worst, it's a ticking time bomb security budget cliff.