One strategy has decades of evidence. The other has decades of underperformance.
Market timing feels rational. The data consistently shows otherwise. Missing just the ten best days in a decade can cut long-term returns in half.
The Situation
Market timing — moving money in and out of investments based on market forecasts — is intuitively appealing and nearly universally unsuccessful over long periods. The reason is structural: the best market days cluster around the worst days. An investor who exits to avoid the lows frequently misses the recoveries that follow immediately after.
Nobody rings a bell at the bottom. The investors who are present for the recovery are the ones who didn't leave during the decline.
— Worthune Decision Framework
The Evidence · Steps 1 & 2
In most 20-year periods, the majority of total market returns are concentrated in a small number of trading days. These days are unpredictable in advance and tend to immediately follow periods of maximum fear — exactly when market timers have exited.
The days you can't predictAn investor fully invested in the S&P 500 from 2003–2022 earned approximately 9.8% annualized. The same investor who missed the 10 best days earned 5.6%. Missing 20 best days: 2.6%. Missing 30 best days: 0.4%. The 'safe' exit is rarely safe.
Calculate the actual costApplying the Principle · Steps 3 & 4
Decide in advance what you will do when your portfolio drops 20%, 30%, or 40%. Writing this down when markets are calm produces better decisions than making it in real time when fear is highest.
Decide in advanceMarket declines only force bad decisions when you need the money you've invested. Ensuring your emergency fund and near-term expenses are in non-market accounts removes the behavioral pressure to sell during downturns.
Separate by time horizonBuilding Resilience · Steps 5 & 6
Automatic monthly contributions mean you buy at all market levels — high and low. This dollar-cost averaging removes the need to decide whether 'now is a good time' because contributions happen regardless.
DCA removes the decisionFrequent portfolio checking during volatile markets increases the probability of emotional action. Set a specific review cadence (monthly or quarterly) and avoid checking in between, especially during news-driven declines.
Check less, earn moreAfter the Work
After evaluating your investing behavior:
Your structure supports long-term compounding. Protect it during the next decline.
Review the evidence on the cost of missing the best days. The data is consistent across periods.
A systematic re-entry plan (e.g., investing a fixed amount each month over 6–12 months) reduces re-entry timing risk.
The market has always recovered from every previous decline. The investors who benefited were the ones still present.
Next Step
Use Worthune's market scenario modeler to see the historical impact of staying invested vs timing decisions across different market conditions.
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