Dollar-Cost Averaging
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Dollar Cost Averaging vs Lump Sum — What the Evidence Shows

Dollar cost averaging (DCA) means investing a fixed dollar amount at regular intervals — weekly, fortnightly, or monthly — rather than investing a lump sum all at once. When prices are lower, your fixed dollar amount buys more units. When prices are higher, it buys fewer. Over time, this produces an average cost per unit that is lower than the simple average of prices during the period — this is the mathematical effect known as the DCA advantage.

The academic evidence — when lump sum wins

Research consistently shows that lump sum investing outperforms DCA approximately two-thirds of the time in equity markets. The Vanguard Research paper "Dollar-cost averaging just means taking risk later" (2012) found that lump sum investing produced higher final wealth than DCA in 67% of cases across the US, UK, and Australian markets. The reason is straightforward: equity markets spend more time rising than falling, so money sitting on the sidelines waiting to be deployed via DCA sacrifices market exposure. When markets fall, DCA's reputation looks compelling in retrospect — but it is impossible to time this in advance.

When DCA is the right strategy — and why most Australians already use it

DCA is the natural strategy for investors who receive income regularly and invest from each pay cycle rather than from a windfall. Most Australians effectively DCA into super via their employer's SG contributions. DCA also reduces the psychological risk of regret: if you invest a large lump sum and markets fall the next week, the behavioural cost of that timing can cause investors to sell at the worst moment. For investors who struggle to "buy the dip" psychologically, a consistent DCA approach often produces better real-world outcomes than a theoretically superior lump sum strategy they can't emotionally execute.