Property is only useful in securing someone’s safety and happiness. The less essential it is for their wellbeing, the less it should be considered their exclusive property. In practice this means limiting the maximum ownership someone can have through taxes. As property held increases, taxes become exponentially higher. You can hold more property by substituting the difference with your income, but only to a certain extent. Your income will be taxed progressively as well, and the will be an upper limit to the property you can ever own by yourself.

The key wrinkle is how to handle IP. The solution probably lies in making it impossible for IP rights to be traded or sold, limiting exclusivity to shorter durations(irregardless of the creator’s lifetime), and taxing the property and income they get from their idea.