#DollarCostAveraging
Dollar Cost Averaging (DCA) is an investing strategy where you invest fixed amounts at regular intervals regardless of price, averaging out the cost over time. It became the default strategy for 401k contributions and automated investing apps.
How It Works
Instead of investing $12,000 as a lump sum:
- Invest $1,000/month for 12 months
- Buy more shares when prices are low
- Buy fewer shares when prices are high
- Average cost per share smooths out over time
Advantages
Removes emotion: No need to time the market or worry about buying at the peak
Reduces regret: Avoid the pain of investing everything right before a crash
Accessible: Start with small amounts vs waiting to save lump sum
Automatic: Set and forget with automatic transfers
The Debate
Lump Sum vs DCA: Vanguard’s 2012 study found lump sum investing beat DCA 67% of the time historically, because markets trend up. However, DCA provides better sleep-at-night factor and risk management.
DCA into a bear market: Dollar cost averaging shines when buying during prolonged declines (2008-2009, 2020 COVID crash, 2022 bear market).
Opportunity cost: Holding cash while DCA-ing means missing out on gains if market rallies immediately.
Modern Implementation
Automated apps (2015+):
- M1 Finance: Auto-invest every deposit
- Acorns: Round-ups + recurring deposits
- Robinhood: Recurring investments feature
- Vanguard/Fidelity: Automatic investments
Retirement accounts: 401k contributions from each paycheck are inherently DCA strategy.
By 2023, DCA became the Bogleheads-approved strategy for most investors, especially those unable to invest lump sums or psychologically uncomfortable with market timing.
Sources:
- Vanguard “Dollar-cost averaging just means taking risk later” (2012)
- Bogleheads wiki DCA page
- Financial advisor DCA vs lump sum analyses