The radio spectrum -- those airwaves we say belong to the American people -- should be treated as our common treasure, not purchaseable by corporations. Lease them out for, say, 5 years or 10 years, and then put them up for bids again.

We all need clean air. We all need clean water. Those who use lots of water are usually charged by their local utility for what they take. Some farms and water bottlers deplete the local resource, and they ought to be charged for what they take from the commons, if the carrying capacity can't handle it.

Supermarkets in Manhattan are amazingly inventive in providing a lot of groceries in a space whose smallness would be unimaginable in suburbia -- and is difficult to "social distance" in today.

In the city, that supermarket woudl not be a single-story building; it would have a 20- or 40- or more story building overhead, and all those users would share the land value tax.

And the building would not be taxed, so no downside to fully developing, and regularly redeveloping, the lot to serve human needs.