[Dracophoenix]

>> "Land and gas tax are economically efficient."

Isn't the former already expressed in the form of property tax? And if so, I wouldn't say it's economically efficient. Calculating the value of land/real estate is a blackbox (at least at the local level) only to be known and determined by the taxing entity (i.e government).

[MrPowers]

Land taxes are different than property taxes. Property taxes are on the building, land taxes are just on the land.

Land isn't a perfect tax, still needs to be levied as you mentioned, but it cannot be hidden and incentivizes land owners to use the land for its "highest and best use". There are no complicated depreciation schedules, credits, deductions, etc. for land. It's also highly progressive.