Investor Corner/Staying the course/Closing Mindset Pieces
6.1.2 The Only Free Lunch
Diversification is often called the only free lunch in investing, because it can genuinely reduce a portfolio's overall risk without necessarily reducing its expected long-run return. Every other lever in investing involves a real trade-off between risk and return.
Why this particular benefit is unusual
Most decisions in investing involve accepting more risk in exchange for more expected return, or accepting less risk in exchange for less expected return. Diversification is the rare exception: combining assets that do not all move together in perfect lockstep can genuinely reduce a portfolio's overall volatility without necessarily reducing its overall expected return, purely because the combination smooths out swings that would otherwise be more extreme in any single holding.
Why this works mathematically
If two assets do not move in perfect lockstep with each other, the combined portfolio of both will generally be less volatile than either asset held on its own, even while the combined expected return sits somewhere between the two individual expected returns. This effect strengthens the more genuinely different the two assets' behaviour is from one another.
The one thing diversification cannot do
Diversification reduces the specific risk of any single holding disproportionately affecting an outcome; it does not eliminate broad market risk that affects most assets at once, and it does not guarantee a positive return in every period. It is a genuinely powerful, largely free tool, but not a complete substitute for appropriate overall risk-taking in the first place.
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