DOLLAR-COST AVERAGING (DCA)
Plain English
Dollar-cost averaging means investing a fixed dollar amount at regular intervals — weekly, biweekly, or monthly — regardless of what the market is doing. Instead of trying to pick the perfect entry point, you buy consistently. Over time, you end up with a lower average cost than most people who try to time the market.
Going deeper
Dollar-cost averaging (DCA) is a systematic investment strategy that removes the psychological pressure of market timing. By investing a fixed amount on a set schedule, you automatically buy more shares when prices are low and fewer when prices are high. Over time, this produces an average purchase price that tends to be below the average market price. DCA is especially effective for volatile assets because it smooths out the entry point across market cycles. Most 401(k) contributions are effectively DCA — every paycheck, a fixed amount goes in regardless of market conditions. DCA does not guarantee a profit or protect against loss in declining markets, but it eliminates the risk of deploying all capital at a market peak. Lump-sum investing outperforms DCA in about 66% of historical periods when markets are trending up — but DCA dramatically reduces regret risk and volatility of outcomes.
Examples
The Math in Action
Month 1: $500 at $100/share = 5 shares. Month 2: market dips — $500 at $80/share = 6.25 shares. Month 3: $500 at $90/share = 5.56 shares. Total: $1,500 invested, 16.81 shares, average cost = $89.24/share. The average market price over three months was $90. DCA beat it by $0.76/share.
Emotional Advantage
In March 2020, markets fell 34% in 30 days. Lump-sum investors who had just deployed capital were devastated and often sold. DCA investors bought through the crash — their automatic contributions at the low became some of the best purchases of the decade.