Definition
Dollar-cost averaging (DCA) is an investing method where you buy a fixed dollar amount on a regular schedule, no matter how much the price moves up or down. You get fewer shares when the price is high and more when it's low, so your average cost per share ends up at or below the simple average of the prices on your buy dates (that doesn't mean it's always cheaper than buying all at once).
What happens when you spend the same amount on apples every month
Picture a fruit stand where the price of one apple changes each month: 1,000 won (about $0.75), then 2,000 won, then 500 won. Instead of deciding how many apples to buy, you set a fixed budget of 10,000 won (about $7) every month.
When apples jump to 2,000 won, you only get 5. When they crash to 500 won, you get a whopping 20. You automatically buy less when it's pricey and a lot more when it's cheap. Add it up later, and your average cost per apple comes out lower than the average market price.
This is the core idea of dollar-cost averaging: buy with a fixed amount of money to bring down your average cost. You don't have to agonize over when to buy, because you automatically pick up more when prices are low.
It takes the stress out of not knowing when to buy
The hardest part of investing in stocks or funds is guessing, "Is now the cheapest time to buy?" Even financial professionals say that calling the exact bottom or the exact peak in advance is nearly impossible.
If you put all your hard-earned savings in at once and the market tanks right away, you take a big loss and it's tough to stay calm. But if you buy a fixed amount at regular intervals, a downturn becomes a chance to pick up more shares at lower prices.
This approach works as a safety net that helps you keep a steady mind and stay invested for the long term, even when prices wobble.
To be precise: it's not a way to always make the most money
Dollar-cost averaging is not a magic formula that delivers the highest return in every situation. If the market just keeps climbing with no dips, putting in a lump sum at the start ends up making you more money. In a 2012 study by the U.S. asset manager Vanguard, which looked at historical data from the U.S., U.K., and Australia, investing a lump sum came out ahead roughly two times out of three. But the margin was usually small.
Still, nobody in the world knows in advance whether prices will keep rising or turn down. That's why this method is used less to chase the biggest possible gain and more as a strategy to reduce the big risk of bad timing.
It also can't change the value of what you're buying. If a company keeps heading toward collapse, you can't avoid losses no matter how finely you split up your purchases.
Common misconceptions
Dollar-cost averaging always earns a higher return than investing a lump sum.
In a market that just keeps rising, buying everything up front can come out ahead. The real goal of DCA isn't the highest return. It's to reduce timing risk and lower your chances of a bad outcome.
Where you meet it
Every payday, you automatically buy 300,000 won (about $220) of an ETF that tracks a major U.S. index, like an S&P 500 fund. That's a classic recurring-investment plan.
When buying a volatile asset, instead of buying all at once, you split it into 10 purchases of 100,000 won (about $75) each, one every Monday.
In the U.S., putting a fixed amount from every paycheck into your 401(k) works the same way.
In one sentence
It's an investing method where you buy a fixed amount at regular intervals regardless of price swings, which smooths out your average cost and reduces timing risk.