Unfortunately, tax rate, and even capital gains tax, won’t fix this issue.

Stock buybacks and bank loans are a huge contributor. Watch this video about buy, borrow, die. Unrealized gains on assets can be turned into untaxed realized gains through the use of incredibly unfair bank loans with wildly low interest rates that are only offered to the super wealthy. You have ban banks from making those kind of loans, otherwise the wealthy will simply claim an income of a dollar every year, switching over to taking all or most their income in the form of stocks and other appreciating assets. They can borrow against it indefinitely.