The most glaring problem with taxes of this form in the system we have today is that there is no way to price it that does not either price regular people out of the system or allow all regular people's assets that fall under this scheme to be purchased for (relative) peanuts by the superwealthy and megacorporations.
That is to say, the prices you'd have to set to prevent very wealthy bad actors from just buying up everything and holding everyone hostage to it are so high that regular people would never be able to sustain them. And once they have obtained all the Stuff, even if they can't change the rules to make it so they no longer have to pay, they only have to keep the Harberger prices high for a fairly short time for the rents they charge us to bleed us dry enough that we have no chance of buying any of it back.
> That is to say, the prices you'd have to set to prevent very wealthy bad actors from just buying up everything and holding everyone hostage to it are so high that regular people would never be able to sustain them.
I think you're saying that, under a harberger taxation scheme, if your asset's (let's say it's a house) fair market value is $500k, you wouldn't be able to afford the taxes if you declared its value at $750k to make sure you wouldn't have to move unless someone (e.g. Blackrock) paid you enough to deal with that hassle.
But there's no reason to expect the prices on an extra 50% above market value to be ruinous, unless the harberger tax is set to near the full rental price of the asset, e.g. harberger-enabled Georgism.
And if the harberger tax is set to the full rental price of the asset, then Blackrock cannot make tons of money by buying the asset and renting it back to you; they will have all the rental income taxed away. It would lose them money every day they held onto it, and commonly-proposed harberger amendments like requiring the buyer to pay on their initially declared value for at least a year would quickly turn their ledgers into Redrock.
That is to say, the prices you'd have to set to prevent very wealthy bad actors from just buying up everything and holding everyone hostage to it are so high that regular people would never be able to sustain them. And once they have obtained all the Stuff, even if they can't change the rules to make it so they no longer have to pay, they only have to keep the Harberger prices high for a fairly short time for the rents they charge us to bleed us dry enough that we have no chance of buying any of it back.