Imagine the worst possible timing. The economy turns, your industry gets hit and you lose your job. Money is suddenly tight so you go to check the one thing that was supposed to protect you your investment portfolio and discover it just fell 30% too. Not by coincidence. It fell for the exact same reason you lost your job.
That is not bad luck. That is a design flaw and it is hiding in a shocking number of otherwise sensible portfolios. I call it double exposure the quiet habit of...