investing 2026-04-17
Dollar-Cost Averaging Deep Dive
When DCA helps, when lump-sum wins, and how to combine the two.
Dollar-cost averaging means investing equal amounts at fixed intervals regardless of price.
Mechanics
Invest $500 monthly. When prices are low, buys more shares; when high, fewer.
What DCA Wins At
Behavior, not returns.
- DCA underperforms lump sum about 65-70% of the time over 10-year windows
- DCA reduces regret of investing right before a crash
- DCA provides discipline
When Lump Sum Wins
Vanguard's research shows lump-sum beats 12-month DCA in roughly two-thirds of historical periods.
When DCA Wins
- Highly volatile markets
- When you don't have a lump sum (most investors via paychecks)
- Behavioral protection against panic-selling
Hybrid Approach
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50% invest immediately
50% DCA over 6-12 months
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Automating DCA
The best DCA is the one you don't have to think about.
Educational only. Not financial advice.