I think a better thing to do is to have what I would consider to be "high on the hog" taxes. Purchases of over a certain amount should be highly taxed. Property over a certain value should be highly taxed. It should vary by what you're purchasing. Obviously, buying a $20,000 car is different than a Rolex. I don't think it matters that much if a billionaire has paper wealth. It's what amount of resources (labor, raw materials) plus any externalities such as environmental impact any individual is using. Obviously some high expenses use more resources than others (like a yacht versus front row seats to an event-somebody needs to sit in the front row and it doesn't use any extra labor, it's essentially just a transfer of wealth from one rich person to another). As a society we should find ways to increase the number of essentials on the market (food, shelter, energy, healthcare) so that the middle class can really start enjoying the benefits of increased productivity.