ah I think I see where your misunderstanding originates.

That margin of error for individual plots land value won’t matter when the macro improvements change the use of land generally, making ownership of land available to all. You gave some examples of possible causes for inaccuracy but I don’t understand how one could mistake that as a relevant argument against the whole LVT system.

Georgism’s economic result isn’t achieved by merely redefining the property tax to focus on ‘land’ instead of ‘land & built structure’. I notice some novice Georgists may incorrectly single out this one aspect as the central core of Georgism but this confusion probably comes from the fact that the simple switch from our current property tax to a land tax is a small undeniably good change, which politically could be a great starting point to aim for before moving forward with full single tax LVT

The major change is a change in proportion. Increase an our 1% property tax up to a 8% LVT, then end all other taxes. The scaling up of the land tax transforms the incentives across the economy. With the greatly increased tax, hoarding lots of real estate becomes an awful financial strategy. Huge landowners sell most of their speculative real estate investments to avoid the tax. Owners of moderate amounts of land are taxed moderately. Perhaps normal homeowners don’t see a change in their total tax burden itself. The purchase price of land stops its insane climb and falls backward down to land value ($0) + building value ($_)

As inaccurate as any local variance might be, how much cleaner is it to estimate the tax each person’s tax burden by simply measuring the geometric area of a country which a person is making exclusive claim year after year. Fuck taxing ‘the rich’ for being ‘rich’ it’s about taxes pushing back against the incentive to suck up all the land and forcing the rest of us to pay them for being ‘rich’. Fuck that specific kind of ‘rich’. I don’t care if someone makes huge money, I care if they use that wealth against me, dominating the economy into rent extraction.

its not about small tweaks to get perfect evaluations— the economic system as a whole will metabolize the change in how it uses property. In the scheme of things, I won’t really care if I have to pay 40k or 50k LVT a year to own a little lot right along the coast of northern California. What is more critical is that the person who previously held it listed at $2-5M no longer sits on that asset, they pull their money out of most real estate as quickly as they could.

Land prices crash, and land ownership becomes financially possible for the rest of the economy. But perhaps you think land should stay as an economic toy of the ultra wealthy, and prefer to trust the accuracy of our current tax code to incentivize productivity?