What is portfolio 'risk', really?

We throw the word 'risk' around constantly, but rarely stop to define it. Most people picture it as how wildly a price bounces around. That's part of the story — but it misses the part that actually hurts.

Volatility vs real danger

Volatility is the day-to-day wobble. It's uncomfortable, but if you don't need the money soon, you can ride it out. The deeper risk is permanent loss — money you don't get back — and being forced to sell at the worst possible time because you needed the cash or couldn't stomach the fall.

A more useful definition

Think of risk as the chance that your money isn't there when you need it, in the amount you were counting on. That reframes things. A bumpy investment you'll hold for twenty years may be low-risk for you. A 'safe-looking' one you'd panic-sell in a downturn may be high-risk.

• How much could this fall, and could I hold through it?
• Would I be forced to sell at a bad moment?
• How much of my portfolio would move together if one thing went wrong?

Volatility is the weather. Risk is whether you're dressed for it.

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