It's a very important question to ask: how big should the investor's bill be? For labor, for durable goods, for energy, etc., the investor pays in proportion to what they have taken from others.

But what has the investor taken from the public when they build? The best possible answer, in my opinion, is the value of the land they occupy. This exclusive use of a portion of land deprived all others from using it. That is the value of the land, and there are roughly two sources of that value: proximity to all the other things that others have built, or access to natural resources, that they land owner did not build.

So that's why the land value is an appropriate object of taxation: it's a payment to us all for what we have been deprived of. A person who builds a massive structure of great value on a piece of land has built that structure, but they didn't build the land or the bounty that the land provides.