Every few years, markets deliver a stretch that makes long-term investing feel naive. Prices fall quickly, the explanation is plausible, and the case for waiting until things settle down sounds like prudence rather than panic. This note is about what the evidence says happens next — and what to do in the meantime.
Declines are the price, not the exception
Over the past century, US equity markets have experienced a decline of 10% or more in roughly half of all calendar years. Declines of 20% or more arrive every five or six years on average. These are not anomalies to be engineered away; they are the mechanism by which equities pay more than cash over time. An asset that never fell sharply would not need to offer a premium.
The uncomfortable corollary is that the long-run returns investors quote — the ones underpinning their retirement projections — are returns earned through those declines, by people who stayed invested during them.
The cost of stepping out
Market timing requires two correct decisions: when to leave, and when to return. The second is consistently harder, because recoveries begin while the news is still bad. A substantial share of the best single days in market history occur within weeks of the worst ones, frequently in the same month.
Studies of investor behavior repeatedly find a gap between fund returns and investor returns — the “behavior gap” — driven almost entirely by buying after strength and selling after weakness. The gap is typically one to two percentage points annually. Compounded across a thirty-year horizon, that is a substantial portion of a retirement.
What to do instead
The useful response to volatility is structural rather than predictive:
- Check that the allocation matches the plan, not the mood. If a 25% decline would force you to change course, the allocation was wrong before the decline — fix it as policy, not as a reaction.
- Harvest losses in taxable accounts. A drawdown is the one reliable opportunity to bank a deduction while keeping market exposure through a similar, non-identical holding.
- Rebalance on your schedule. A large decline usually triggers a rebalancing threshold, which mechanically means buying equities at lower prices. Let the rule act.
- Consider Roth conversions. Converting depressed assets moves the eventual recovery into a tax-free account at a lower tax cost.
- Verify the cash reserve. If you are drawing income, confirm you can fund one to three years of withdrawals without selling equities. That single check converts an emergency into an inconvenience.
The question worth asking
When markets fall, the instinctive question is “how much worse will this get?” — which nobody can answer. The better question is “has anything changed about when I need this money?” For most long-horizon investors, the honest answer is no. A portfolio funding withdrawals beginning in 2041 is not meaningfully informed by this quarter’s headlines.
Volatility is a problem for capital you need soon and a non-issue for capital you do not. The work is making sure you know which is which — before you need to know.
If your plan has never been stress-tested against a severe decline in its first years, that is worth doing while markets are calm. It is a far better use of attention than forecasting the next one.
