Debt, used well

Borrowing against an appreciating asset at a fixed real rate is one of the most powerful tools available to a normal household — and the most overused, on the wrong assets. The same instrument (debt) becomes a wealth multiplier or a wealth drain depending on what you borrow against and at what term.

Most personal-finance content moralises debt as "bad" or "good" categorically. The honest framing is structural: the right kind, at the right rate, against the right asset, multiplies wealth. The wrong kind drains it — and the trap is using good-debt mental models to justify bad-debt behavior.

Mortgage on owner-occupied

good

Federal student loans

context-dependent

Auto loans

borderline

Credit-card carry

bad

Margin / payday

very bad