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📅 March 2026·MarketMVP Educational Guide

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What is Dollar Cost Averaging (DCA)? Investing Strategy Explained

What is dollar cost averaging? Dollar cost averaging (DCA) means investing a fixed amount of money at regular intervals — for example, £200 every month — regardless of whether the market is up or down. When prices are high you automatically buy fewer shares. When prices are low you buy more. Over time this averages out your cost per share.

WHY DCA WORKS — THE SPORTS SEASON ANALOGY

Imagine you commit to spending £200 per month on tickets to watch your team, regardless of their form. In a winning run, tickets are expensive — you get fewer games. In a bad run, tickets are cheap — you get more games. Over a full season, you've paid an average price that neither the best nor worst days could have achieved with a single purchase.

The same principle applies to stock investing. Markets will have good months and bad months. DCA removes the impossible challenge of predicting which is which.

NUMERICAL EXAMPLE

MONTHINVESTEDPRICE PER SHARESHARES BOUGHT
January£200£1002.0
February£200£802.5
March£200£603.3
April£200£902.2
Total£800Average: £82.510.0 shares

The investor bought 10 shares for £800 — an average of £80 per share. If they had invested all £800 in January at £100, they would have only 8 shares.

DCA VS LUMP SUM — WHICH IS BETTER?

Research shows lump sum investing outperforms DCA approximately 66% of the time over 10-year periods (because markets rise more than they fall). However, DCA outperforms in volatile or declining markets, and crucially — it eliminates the psychological challenge of timing a large investment. For most people with regular income, DCA is the natural and psychologically sustainable approach.

FREQUENTLY ASKED QUESTIONS

What is the best amount to invest monthly for DCA?
Any amount you can invest consistently without financial strain. The habit and consistency matters more than the amount. £50/month invested consistently for 20 years significantly outperforms £10,000 invested once and nothing more. Most financial advisors suggest investing 10-15% of income if possible, starting with whatever is currently comfortable.
Should you dollar cost average or invest a lump sum?
If you have a lump sum available, research suggests investing it immediately outperforms spreading it over time about two-thirds of the time. However, if investing a lump sum causes anxiety that might lead to panic-selling during a downturn, DCA is behaviorally superior. For regular income investors, DCA is the natural approach.
Does dollar cost averaging work for individual stocks?
Yes. DCA works for individual stocks the same way it works for index funds — you reduce the risk of buying at the peak. However, the approach assumes your conviction in the stock remains constant over time. With individual stocks, ongoing monitoring of the business fundamentals is important to ensure the thesis remains intact.

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