Perhaps dividends? Interest on deposits and investments? I would hypothesis that if a person has ten million euros sitting in a bank somewhere, it's not just si

Perhaps dividends? Interest on deposits and investments? I would hypothesis that if a person has ten million euros sitting in a bank somewhere, it's not just sitting like dead trees, but perhaps earning interest. Musk does not seem to have too extravagant of a lifestyle, so I presume on what evidence there is, that everything is likely owned and paid for by his companies, as expenses, etc.