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Enrich Your Future 26: Should You Invest Now or Spread It Out?

In this episode of Enrich Your Future, Andrew and Larry Swedroe discuss Larry’s new book, Enrich Your Future: The Keys to Successful Investing. In this series, they discuss Chapter 26: Dollar Cost Averaging.

LEARNING: Invest all your money whenever you have it.

“If you want to put the odds in your favor, which is the best we can do because we don’t have clear crystal balls, you should put all your money in whenever you have it to invest.”

Larry Swedroe

In this episode of Enrich Your Future, Andrew and Larry Swedroe discuss Larry’s new book, Enrich Your Future: The Keys to Successful Investing. The book is a collection of stories that Larry has developed over 30 years as the head of financial and economic research at Buckingham Wealth Partners to help investors. You can learn more about Larry’s Worst Investment Ever story on Ep645: Beware of Idiosyncratic Risks.

Larry deeply understands the world of academic research and investing, especially risk. Today, Andrew and Larry discuss Chapter 26: Dollar Cost Averaging.

Chapter 26: Dollar Cost Averaging

In this chapter, Larry discusses why lump sum investing is better than dollar cost averaging.

Should you invest your money all at once or spread it over time?

According to Larry, the issue of Dollar Cost Averaging (DCA) typically arises when an investor receives a large lump sum of money and wonders if they should invest it all at once or spread it over time. The same problem arises when an investor panics and sells when confronted with a bear market, but then there are two questions: How does the investor decide when it is safe to reenter the market? And does she reinvest all at once or by DCA?

Constantinides, a University of Chicago professor in the 1960s, studied this question. He demonstrated that DCA is an inferior strategy to lump sum investing. He termed it logically dumb as it makes no sense based on an expected return outcome. From a purely financial perspective, the logical answer is that if you have money to invest, you should always invest it whenever it’s available.

Another paper by John Knight and Lewis Mandell compared DCA to a buy-and-hold strategy. Then, it analyzed the strategies across a series of investor profiles from risk-averse to aggressive. They concluded that DCA had no advantage over the two alternative investment strategies. Combined with their graphical analysis, their numerical trial and empirical evidence favored optimal rebalancing and buy-and-hold strategy over dollar cost averaging. Optimal rebalancing refers to the strategy of adjusting the proportions of assets in a portfolio to maintain a desired level of risk and return.

Dollar cost averaging versus lump sum investing

Knight and Mandell conducted a backtest to compare the performance of DCA versus LSI (lump sum investing). Backtesting is a simulation technique to evaluate the performance of a trading strategy using historical data. They backtested the two strategies between 1926 and 2010. Transaction costs were ignored (favoring DCA, which involves more trading). The authors assumed the initial portfolio was $1 million in cash, and the only investment available was the S&P 500 Index:

DCA Strategy: At the beginning of each month, one-twelfth of the initial portfolio was invested—the entire $1 million was invested by the end of the 12th month.
LSI Strategy: The $1 million portfolio was invested on day one.

The study covered 781 rolling 20-year periods. The LSI strategy outperformed in 552 of them—over 70 percent of the time. In addition, in the roughly 30 percent of instances in which DCA outperformed, the magnitude of that outperformance was less than when LSI outperformed.

Specifically, during the 552 20-year periods in which LSI did better than DCA, the average cumulative outperformance was $940,301 on the initial $1 million investment. During the 229 periods in which DCA did better than LSI, the average cumulative outperformance was $769,311.

When dollar cost averaging is the better option

Larry notes that there is an argument to be made in favor of DCA when it is the lesser of two evils—when an investor cannot “take the plunge” because they are sure that if they were to invest all at one time, that day would turn out to be the high not exceeded until the next millennium. That fear causes paralysis.

If the market rises after they delay, how can they buy now at even higher prices? And if the market falls, how can they buy now because the bear market they feared has arrived? Once a decision has been made not to buy, how do you decide to buy?

There is a solution to this dilemma that addresses both the logical and the emotional issues. Larry advises an investor to write a business plan for their lump sum. The plan should lay out a schedule with regularly planned investments. The plan might look like one of these alternatives:

Invest one-third of the investment immediately and invest the remainder one-third at a time during the next two months or the next two quarters.
Invest one-quarter today and spread the remainder equally over the next three quarters.
Invest one-sixth each month for six months or every other month.

Adopt a glass is half-full perspective

Having accomplished these objectives, Larry says, the investor should adopt a “glass is half full” perspective. If the market rises after the initial investment, they can feel good about how their portfolio has performed. She can also feel good about how smart she was not to delay investing.

If, on the other hand, the market has fallen, the investor can feel good about the opportunity they now have to buy at lower prices and about being smart enough not to have put all of their money in at one time. Either way, the investor wins from a psychological perspective. This is an important consideration because emotions play an essential role in how individuals view outcomes.

Lump sum investing is the way to go

While DCA may sometimes work, Larry insists that putting all your money at once gives you the best odds of having the most money. If you want to put the odds in your favor, which is the best we can do because we don’t have clear crystal balls, he says, you should put all your money in whenever you have it to invest. Unfortunately, despite all the evidence, investors and advisors still recommend DCA.

Enrich Your Future 26: Should You Invest Now or Spread It Out?

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