What is Dollar-cost averaging (DCA)?
DCA (muntazam investitsiya)
In short
Investing the same amount every month (or week) regardless of price. It removes the need to time the market.
Also known as: dollar cost averaging
DCA (dollar-cost averaging) is the strategy of investing the same amount at fixed intervals (for example, monthly) regardless of the price. It removes the question "is now a good time to buy?".
How it works
Because the amount is fixed, you buy more shares when the price is low and fewer when it is high. As a result, your average cost per share ends up below the simple average of the prices over the period.
- Average cost = Total money invested ÷ Total shares bought
Who it suits
DCA suits long-term investors who invest regularly from a monthly income. It works hand in hand with compounding and reduces the risk of panic-selling in a downturn — because a drop becomes a chance to "buy cheaper". It is often applied to broadly diversified ETFs, including halal ETFs.
Limitations
DCA does not protect against losses: if an asset declines for a long time, you lose too. In periods when the market rises steadily, investing the whole sum at once (lump sum) has historically often done better — DCA's edge is mostly psychological and about discipline. Applying DCA to a single weak stock, especially one in steady decline, is risky.
Over 5 months $1,200 bought 30 shares: 5 + 6 + 8 + 6 + 5. The average cost is $40 while the price is back at $48 — the portfolio is worth $1,440 (+20%), even though the price only returned to where it started.
$12,000 put in, worth ~$18,300. Most of the gap appears in the last years — compounding speeds up with time. 8% is an example, not a promise.
Example
An investor puts $200 a month into a fictional ETF. Prices over four months: $50, $40, $25, $50.
- Month 1: $200 ÷ $50 = 4 shares
- Month 2: $200 ÷ $40 = 5 shares
- Month 3: $200 ÷ $25 = 8 shares
- Month 4: $200 ÷ $50 = 4 shares
Total: 21 shares for $800. Average cost: $800 ÷ 21 ≈ $38.10, while the simple average price is ($50 + $40 + $25 + $50) ÷ 4 = $41.25. At the end of month 4 the portfolio is worth 21 × $50 = $1,050 — +$250 even though the price only returned to where it started. Investing the full $800 in month 1 would have bought 16 shares, still worth $800. You can project the long-term result with the compound interest calculator.
Mistakes and tips
Automate it: buying on the same date each month separates discipline from emotion.
Don't stop DCA when prices fall — that is exactly when it helps the most.
Apply DCA to a diversified fund or solid companies, not a single speculative stock.
Frequently asked questions
- DCA or lump sum — which is better?
- In a historically rising market, lump sum has often returned more, while DCA reduces the risk of bad timing and the psychological pressure. For most people investing monthly from income, DCA is the natural choice.
- Should I DCA monthly or weekly?
- Over the long run the difference is small. What matters is consistency and low trading costs.
Learn it in the Academy
This term is covered with hands-on examples and a quiz in these lessons of the interactive course.
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