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Short Summary
Main recommendation: long-term investors should not treat cash as their core investment, even when cash yields around 5%, and are generally better off holding stocks and bonds. Cash is safe day to day but has an unpredictable expected return, offers no hedge against falling expected returns, and has historically been more likely to lose purchasing power over long horizons. Cash remains appropriate for emergency funds and short-term needs.
Key Points
- Cash is a poor hedge for long-term investors: its stable nominal value hides the risk that expected future returns fall, while long-term inflation-indexed bonds lock in future income.
- The current 5% cash yield is a poor predictor of long-term cash returns; the link between short-term and long-term cash returns is at best very noisy.
- Stocks and bonds have historically earned a risk premium above cash, and that premium has persisted even when interest rates are high.
- Over 30-year horizons, historical real loss probabilities were higher for government bills (37%) than intermediate bonds (27%), domestic stocks (13%), and international stocks (4%), based on a sample of 38 developed markets from 1890 to 2019.
- "Buying the dip" (holding cash until a 10 to 20% market drop, then investing) trailed investing a lump sum most of the time, and by a wide margin on average.
Details Worth Noting
- Concrete instructions: Keep cash set aside in an emergency fund for short-term needs, and do not keep that cash in anything volatile. For long-term money, the speaker's framework is to consider long-term inflation-indexed bonds as the risk-free asset rather than cash, and to invest lump sums in stocks and bonds rather than waiting to buy dips.
- The speaker frames the risk-free asset for a long-term investor as a long-term inflation-indexed bond, because locked-in coupon payments let the investor ignore interim price drops, though these bond prices can be very volatile (as seen in 2022).
- Short-term investors care about price volatility, while long-term investors care more about how expected returns change; a portfolio drop offset by a rise in expected return is largely irrelevant to a long-term investor.
- Example given: if you need $50,000 per year for 30 years, a 30-year bond locks in that income even if rates fall, whereas a one-year bond at 5% exposes you to a large shortfall if rates drop to 3%.
- The speaker's data: in a global sample of countries with histories back to 1900, five-year stock and bond returns increased with higher starting real interest rates.
- Caveat: the speaker notes cash is appropriate for short horizons, where it has been safer than stocks and bonds, and that the video concerns money directed toward long-term investments.
- This is investment commentary from the speaker, not individualized professional advice.
Bottom Line
Cash's stable price makes it comfortable, but for money that is truly long-term, its unpredictable returns and higher long-run purchasing power risk make it a weaker choice than stocks and bonds, even at a 5% yield.
