Dollar Cost Averaging — Trading Wiki

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What Dollar Cost Averaging means

Dollar-cost averaging means contributing fixed amounts at regular intervals regardless of price. It changes purchase timing and the units acquired; it does not guarantee a lower average cost or outperform a lump-sum investment.

In depth

Dollar Cost Averaging (DCA) is an investment strategy where a fixed dollar amount is invested into a specific asset at regular intervals — weekly, bi-weekly, or monthly — regardless of the asset's current price. Equal contributions buy more units at lower prices and fewer at higher prices. The resulting average cost can be above or below a lump-sum purchase; the price sequence and costs determine the comparison. Price variation changes the units acquired under a fixed contribution schedule; that is a purchase-timing effect rather than a guaranteed mathematical advantage.

In a volatile asset like Bitcoin, a $500 monthly investment over 12 months will purchase more BTC during months when the price is depressed and less during price peaks. A fixed schedule reduces decisions about purchase dates but does not eliminate emotion, automate every product or guarantee a better result. For a hypothetical example without fees, investing $100 when a unit costs $10 buys 10 units; another $100 at $20 buys 5. The combined 15 units cost $200, or about $13.33 per unit. Investing the same $200 entirely at the first $10 price would buy 20 units, while investing it entirely at $20 would buy 10.

These examples show how timing changes the quantity purchased. They do not imply that either contribution schedule will outperform across a different price path or after costs.

Key points

• Fixed amount invested at regular intervals regardless of price
• Equal scheduled contributions buy more units at lower prices and fewer at higher prices; DCA is distinct from a discretionary decision to add to a losing position
• A schedule defines purchase timing without eliminating emotion or guaranteeing a better result

Why it matters when you are learning

Calculate units bought under equal contributions at different hypothetical prices. Compare the same total cash over the same dates; a schedule does not establish a better return.

Worked exercise and its limits

With fee-free $100 contributions at $10 and $5, buy 10 + 20 = 30 units for $200. Average purchase cost is about $6.67, yet at $5 the holding is worth $150, a $50 loss. A lower average cost does not imply a gain.