What Is Dollar-Cost Averaging? (And Why It Works)

Dollar-cost averaging (DCA) means investing a fixed amount of money at regular intervals — regardless of whether the market is up or down. It's not glamorous, but decades of data show it beats market timing for most investors.

How Dollar-Cost Averaging Works

Instead of investing $12,000 all at once, you invest $1,000 every month for 12 months. When prices are high, your $1,000 buys fewer shares. When prices are low, your $1,000 buys more shares. Over time, you automatically buy more when things are cheap.

A Simple Example

• Month 1: Stock at $100 → you buy 10 shares
• Month 2: Stock at $50 (market dip) → you buy 20 shares
• Month 3: Stock at $80 → you buy 12.5 shares
• Total: invested $3,000, own 42.5 shares, average cost $70.59/share
• If you'd invested all $3,000 at $100: only 30 shares

Why DCA Beats Timing the Market

• Nobody consistently times the market — not even professionals
• Missing just the 10 best days in a decade can cut your returns in half
• DCA removes emotion — you invest the same amount whether markets are scary or euphoric
• It turns market dips into opportunities (you buy more cheap shares)

When Lump Sum Investing Beats DCA

Mathematically, if you have a large sum to invest, investing it all at once beats DCA about 2/3 of the time because markets trend upward over time. But the emotional and behavioral benefits of DCA often outweigh this mathematical edge for most people.