The single hardest thing in investing is knowing when to buy. The good news: you don’t have to. Dollar-cost averaging sidesteps the whole problem.
A fixed amount, on a schedule
Dollar-cost averaging (DCA) means investing the same amount of money at regular intervals — say $200 every month — no matter what the market is doing. You don’t wait for the “right” moment; you just keep buying on schedule.
The clever part
Because you invest a fixed dollar amount, you automatically buy more shares when prices are low and fewer when prices are high — exactly the behaviour you’d want, done without any decision at all. The diagram shows it: your biggest share-haul comes at the bottom, when each dollar buys the most. Over time this can lower your average cost per share.
Why it beats market timing
Trying to time the market — waiting for the bottom — fails for almost everyone, because nobody can reliably call tops and bottoms, and the cost of sitting in cash waiting is steep. DCA removes the guesswork and, just as importantly, the emotion: you keep investing through downturns instead of freezing up.
It’s also how most people invest naturally — a slice of each paycheck — which makes it easy to automate and stick with.
Worked example
You invest $300 every month for three months as the price bounces around:
| Month | Price | Shares bought ($300) |
|---|---|---|
| 1 | $30 | 10.0 |
| 2 | $20 | 15.0 |
| 3 | $25 | 12.0 |
You spent $900 and own 37 shares, so your average cost is $900 ÷ 37 ≈ $24.32 — below the average of the three prices ($25), because your fixed $300 automatically bought more shares in the cheap month and fewer in the dear one. No forecasting required.
The takeaway
Dollar-cost averaging — investing a fixed amount on a regular schedule — automatically buys more when prices are low, removes the impossible task of timing the market, and takes emotion out of the decision. Consistency beats cleverness. (This is education, not financial advice.)