What is Dollar-Cost Averaging? DCA Investing Explained

Dollar-Cost Averaging (DCA) is one of the simplest and most effective investment strategies available. Instead of trying to time the market with a single lump-sum investment, you invest a fixed amount of money at regular intervals — regardless of whether prices are high or low. Over time, this strategy automatically buys more shares when prices are low and fewer when prices are high.

How DCA Works in Practice

Imagine you have €500 to invest monthly. In January, VWCE costs €100/share — you buy 5 shares. In February, it drops to €80 — you buy 6.25 shares. In March, it recovers to €110 — you buy 4.5 shares. After 3 months, you own 15.75 shares for a total cost of €1,500. Your average cost per share is €95.24 — lower than the current price of €110.

DCA vs Lump Sum: Which Wins?

Academic research consistently shows that Lump Sum investing outperforms DCA about two-thirds of the time, because markets tend to rise more often than they fall. If you invest a lump sum at any random point in history, the market typically goes up. However, DCA drastically reduces the emotional and financial risk of investing all your money at a market peak.

DCA for European ETF Investors

DCA is the natural strategy for European investors who invest their monthly savings. Choose a low-cost UCITS accumulating ETF (like VWCE or CSPX), set up a regular savings plan (many brokers like Trade Republic, Scalable Capital, or DeGiro offer free monthly ETF savings plans), and let compound interest do the rest. Automate your monthly investment and avoid checking prices daily.

"Dual momentum is the clean integration of relative strength momentum and trend following absolute momentum. They complement each other perfectly." — Gary Antonacci

The GEM Execution Rules

GEM is rebalanced exactly once per month. At the end of each month, the investor carries out the following steps:

1. Calculate the trailing 12-month return of S&P 500 (representing US stocks) and MSCI ACWI ex-US (representing global stocks).
2. Select the index with the higher return.
3. Compare the return of this winning index to the trailing 12-month return of 1-3 Month Treasury Bills (cash proxy).
4. If the winning equity return is greater than cash, invest 100% in that equity index. Otherwise, invest 100% in a broad U.S. Aggregate Bond index (like BND or AGG).

Why GEM Works

Historically, equities spend about 70-80% of the time in bull markets. Relative momentum keeps the investor aligned with the strongest equity markets (whether that's US tech stocks or international value plays). However, when severe bear markets emerge (such as the 2008 financial crisis or the 2000 dot-com crash), absolute momentum acts as a circuit breaker, moving the entire portfolio into high-quality bonds. This reduces drawdown risk and protects capital.

ETF Implementations

A typical retail investor can implement GEM using just three low-cost, liquid ETFs:

• US Stocks: Vanguard S&P 500 ETF (VOO) or SPDR S&P 500 ETF (SPY)
• International Stocks: Vanguard Total International Stock ETF (VXUS) or iShares Core MSCI ACWI ex U.S. ETF (ACWX)
• Aggregate Bonds: Vanguard Total Bond Market ETF (BND) or iShares Core U.S. Aggregate Bond ETF (AGG)