That's what diversification achieves - it reduces the volatility of a portfolio.My point is that if I wanted to reduce the volatility from here using a traditional 60/40 split, I’d have equities and cash.
Diversification strives to smooth portfolio returns, so the positive performance of some investments neutralises the negative performance of others. The benefits of diversification only hold if the securities in the portfolio are not perfectly correlated - that is, they respond differently, often in opposing ways, to market influences.
Long-term bonds are volatile assets - far more volatile than cash. However, adding long-term bonds to an equity portfolio reduced volatility at a portfolio level to a far greater degree than adding cash to an equity portfolio over the last 40 years.
That's because bond prices often rise when equities crash (the flight to safety effect). Cash cannot "respond" to stock market crashes in this way.
Again, cash can dilute equity risk but it cannot diversify equity risk.
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