fill the world with love
'Love' means choosing to make someone else happy.
Ground rents measure the value that society adds to land. That is, how much people will pay just to live in a location.
The price of land measures everything that attracts people: beauty, jobs, safety, a caring community, etc. That is, it measures what makes people happy.
A government that only gets money from ground rent must attract more people in order to make more rent.
Ground rent makes far more money, so the system will spread around the world.
The world will then only care about one thing: