Another point: have you considered that the authorities and people of the Netherlands, a very rich country with several valuable companies, may have possibly thought of this absolutely trivial argument when designing their tax code? Do you really think nobody thought of it?
Jesus
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To your point: stakes in your _own_ company are not taxed as assets, but as income, precisely to avoid the ridiculous situation you point out.
Simply put: your retirement savings, your brokerage account = assets, your startup, your company, your farm = income.