DCA: Why Regular Investing Beats Market Timing

The most common question from a beginner investor is "is now the moment?" The answer almost no one wants to hear is: nobody knows. Even the professionals systematically lose from trying to catch the market's bottom and top.

Dollar-cost averaging (DCA) — averaging out the price — is a strategy that simply removes that question. You invest a fixed amount at equal intervals (for example, €500 every month), regardless of whether the market is up or down.

How the averaging works

Since the amount is fixed and the price changes, you automatically buy more shares when it's cheap and fewer when it's expensive. The result: your average purchase price is often below the average market price over the period.

Here is a concrete example — you invest €600 every month in a volatile market:

After 5 months you have invested €3,000 and own 40 shares. Your average price is €3,000 / 40 = €75 per share. But the plain arithmetic average of the five prices is €80. The volatility that frightens most people actually works for you, because the low prices bring you more shares.

The honest comparison: DCA vs. lump-sum investing

Here it's important to be precise, because there are a lot of myths around DCA. There are two different questions:

1. DCA vs. trying to time the market (timing). Here DCA wins almost always — not because it's mathematically better, but because timing is practically impossible and usually costs you missed days of growth.

2. DCA vs. investing the whole sum at once (lump-sum). Here the truth is more nuanced. If you already have a large sum and the market rises over the long run, putting it in all at once has historically won more often — simply because the money spends more time in the market.

Selurio's calculator shows exactly this. At €500 a month for 10 years and a 7% return:

• DCA accumulates about €85,500 from €60,000 invested.
• Lump-sum (if you had invested the whole €60,000 on day 1) would give about €118,000 — more, because the money grows for longer.

Try it yourself in the DCA calculator. Now change the return to negative — you'll see how, in a falling market, DCA reduces the loss, because you haven't exposed everything at once.

Why DCA is still the right choice for most people

The key fact: most people don't have a large sum ready to go. They invest from their monthly income — and that, by definition, is DCA. The "lump-sum or DCA" question doesn't even arise for them.

Beyond that, DCA brings three real advantages the numbers don't show:

• Discipline. An automatic contribution every month beats good intentions.
• Lower risk of bad timing. You don't stake everything on a single day.
• Emotional calm. It's easier to keep investing during a decline when you know you're buying "on sale."

As we say at Selurio: discipline beats timing.

Assumptions

• A constant return. Real markets move in a jagged line; the calculator assumes an average value.
• No fees or taxes in the calculation.
• The results are hypothetical and not a recommendation for a specific asset or moment of purchase.

Continue reading

• Compound interest — the 8th wonder of the world — what makes your contributions so powerful over time.
• Real return and inflation — so you calculate with real, not nominal, numbers.
• Retiring at 40 in Bulgaria — DCA is the engine behind the long-term plan.

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