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dollar_cost_averaging

The 30-Second Summary

What is Dollar-Cost Averaging? A Plain English Definition

Imagine you love buying fresh apples from the local farmer's market every Saturday. You've decided to budget exactly $10 for apples each week. One week, the apples are a bargain at $1 per pound. Your $10 gets you a hefty 10 pounds of apples. The next week, a cold snap has made them scarcer, and the price jumps to $2 per pound. Your same $10 now only gets you 5 pounds. On the third week, the price settles at $1.25 per pound, and you walk away with 8 pounds. After three weeks, you've spent $30 and have a total of 23 pounds of apples. Your average cost per pound wasn't the simple average of the prices ($1, $2, $1.25), which is $1.42. Instead, your actual average cost was your total cost ($30) divided by your total pounds (23), which comes out to about $1.30 per pound. Without even thinking about it, your fixed-budget strategy made you automatically buy more when the price was low and less when the price was high. This is the essence of Dollar-Cost Averaging. In investing, you simply replace “apples” with “shares of a company or fund” and “pounds” with “number of shares.” DCA is the practice of investing a fixed sum of money at regular intervals—say, $500 on the first of every month—into a particular investment, regardless of the share price. By committing to this automated schedule, you end up buying more shares when the market is down (when they're “on sale”) and fewer shares when the market is up (when they're expensive). It’s a beautifully simple concept that transforms market fluctuations, something most investors fear, into a systematic advantage.

“The investor's chief problem—and even his worst enemy—is likely to be himself.” - Benjamin Graham

This quote from the father of value investing, Benjamin Graham, perfectly captures why DCA is so powerful. It acts as a circuit breaker for our own worst emotional impulses—the fear that makes us sell at the bottom and the greed that makes us buy at the top.

Why It Matters to a Value Investor

While often promoted as a strategy for beginners, Dollar-Cost Averaging is deeply aligned with the core tenets of value investing. A true value investor isn't just looking for cheap stocks; they are cultivating a specific temperament built on discipline, patience, and rationality. DCA is a powerful tool for building and reinforcing that temperament.