You're basically describing a margin account. If you have a portfolio on a margin account at the broker, you can just withdraw money from it up to the amount th

You're basically describing a margin account. If you have a portfolio on a margin account at the broker, you can just withdraw money from it up to the amount that your margin allows. That automatically starts a loan for that amount, collateralised by your portfolio. The problem is that this is not nearly the same as selling stock and withdrawing the sales money, because you keep the risk that the stock will go down thus force liquidating your portfolio. You're conflating selling and borrowing, they're not identical except in these very vague tales about the ultra-rich.