Dollar Cost Averaging
Deploy capital at regular intervals regardless of market conditions to eliminate timing error and build positions systematically.
Dollar cost averaging (DCA) is the practice of deploying capital at regular intervals regardless of market conditions. The core principle is straightforward: don't try to identify optimal entry points or wait for pullbacks. Just buy consistently.
The mechanics
When prices fall, a fixed investment amount buys more units at lower prices, improving your average cost basis over time. When prices rise, the same amount buys fewer units. This mechanical relationship forces you into buying more when things feel worst and less when prices are elevated.
You're not making a forecast about where the market is headed. You're following a process. The entire value of DCA lies in removing the decision of when to buy, which eliminates the primary source of timing error.
Why it works
The temptation to time entries is powerful. Markets feel expensive at highs and terrifying at lows. DCA sidesteps both feelings by making the purchase decision automatic. There is no deliberation, no second-guessing, and no opportunity for fear or greed to interfere.
The decision of when to buy is where most investors introduce the most error. DCA removes that decision entirely.
When to default to broad ETFs
When none of four conditions apply to individual stocks, default to broad ETFs:
- The stock is undervalued
- There is a positive catalyst
- The market is misunderstanding something
- Your allocation is too small relative to your conviction
If you cannot articulate a specific reason to buy an individual stock, a broad market ETF purchased on a regular schedule captures equity returns without requiring stock-specific conviction.
If none of these conditions are met, the best use of your regular investment is a broad index fund. Let DCA do the work while you wait for genuine individual opportunities.
Related
- Crash Buying vs DCA — A detailed comparison of holding cash for crashes versus consistent deployment
- Core vs Exploratory Positions — How DCA fits into a two-tier portfolio structure
- Thesis-Based Selling — The counterpart to systematic buying: selling only when the business changes