[thaumasiotes]

> What would be this persons incentive to own all this land under this model?

It would lower their taxes.

> This doesn't follow from anything. Land would have very low costs only if it is land that nobody wants, just like today. And selling your land will not lead to higher taxes on your remaining land unless the land that you sold gets improved in such a way that it increases the value of your land.

Please don't bother responding if you have no idea what you're responding to.

[Kbelicius]

> It would lower their taxes.

So the incentive to holding unimproved land from which you derive no profit would be so that you would pay less tax then if you would made improvements and profit from those improvements.

> Please don't bother responding if you have no idea what you're responding to.

You should follow your own advice.