La méthode d'achats programmés (dollar-cost averaging), expliquée

Dollar-cost averaging (DCA) is one of the simplest investing strategies there is, which is exactly why it is popular. Instead of trying to pick the perfect moment to invest a lump sum, you invest a fixed amount on a regular schedule — say $200 on the first of every month — regardless of the price that day.

How it works

Because your contribution is fixed in dollars, it automatically buys more units when prices are low and fewer when prices are high. Over time, that pulls your average purchase price below the simple average of the prices you paid at. You never buy everything at the top, and you never have to guess the bottom.

A worked example

Imagine investing $100 a month into an asset over four months, as its price moves around:

You invested $400 and bought 5.5 units. Your average cost is $400 ÷ 5.5 = $72.73 per unit — noticeably below the $77.50 simple average of the four prices, because your fixed payment scooped up more units during the dip. Our DCA calculator lets you model this with your own numbers.

What DCA is good at

• It removes timing pressure. You no longer need a view on whether today is a good day to buy.
• It imposes discipline. Automatic, scheduled investing is hard to derail with emotion — which matters most when markets are frightening.
• It smooths the entry price across a volatile period, which suits assets that swing a lot, like crypto.

What DCA does not do

DCA is a method, not magic. It does not guarantee a profit and it cannot protect you from an asset that simply keeps falling — averaging into something that goes to zero still loses everything. Research also shows that, on average, investing a lump sum immediately tends to beat spreading it out, simply because markets rise more often than they fall and the money is invested sooner. DCA's real edge is behavioural and practical: most people earn and save gradually, and a steady schedule is far easier to stick to than a perfectly-timed bet.

Where it fits

DCA suits long-horizon investing into assets you have already researched and chosen to hold — not a substitute for that research. It pairs naturally with the discipline of sizing your positions to what you can afford to lose, and it works for both crypto and stocks. As always, decide what to buy first; DCA only governs how you pace it.