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I think a scaling inheritance tax that accounts for all assets could work
Company ownership would be wacky after a founder dies since now the government would own most of the company. If the government sells off their shares, the companies value would crash and random other people could get control. So the government would probably need to keep the ownership for a long time at least. Which I guess is one way to nationalize companies.
Better idea: family-owned companies, upon death of the owner, get turned into a coop owned by all the employees of the company, each getting 1 share.
That sounds like a good way to have huge companies with one employee and thousands of contractors. But might be good if you can make it bulletproof.
That just sounds like you need more enforcement against fake subcontracting.