Why dollar-cost averaging is mathematically the right call for 90% of retail investors ā and the 10% case where it isn't. The case FOR DCA on $AAPL and $VOO : 1. Volatility harvesting. When you buy a fixed dollar amount monthly, you automatically get more shares in down months and fewer in up months. Over 5+ years on $VOO, this lowers your average cost basis 1ā4% vs. lump-sum entries. 2. Removes emotional timing. The biggest leak in retail returns isn't bad picks ā it's bad timing (selling in 2020 March, refusing to buy in 2022). DCA takes the decision out of your hands. No "should I buy this dip?" anxiety. 3. Cash-flow alignment. Most retail investors get paid monthly. DCA matches your investment cadence to your income cadence. Lump-sum requires you to either save up (paying opportunity cost) or borrow (paying interest). The case AGAINST DCA ā when lump-sum wins: ā If you have a windfall (bonus, inheritance, sale proceeds), historical data shows lump-sum beats DCA ~67% of the time over a 10-year horizon. Markets go up more often than down. Sitting in cash while DCA-ing means missing average upside. ā If your DCA window is short (<12 months), you're essentially just lump-summing slowly with extra steps. The real takeaway: DCA isn't about beating returns ā it's about behavioural risk management. The $200/month auto-buy into $VOO works because you'll actually do it for 20 years. The "perfect timing" lump-sum doesn't work because you won't actually pull the trigger when the chart looks scary. Pick the strategy you'll actually execute, not the one with the best backtest. Not financial advice.
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