Compounding is one of the most useful financial ideas a person can learn, and most Americans first meet it in adulthood. I’d argue it along with basic financial literacy belongs in the curriculum by middle or high school.
“If you have a really long runway, then a low rate of compounding would still get you a big number. It’s very important in life to start that engine early.” — Mohnish Pabrai
What compounding is
Compounding means earning returns on both your original investment and the returns you’ve already earned. Reinvested earnings generate their own earnings, which creates a snowball effect: growth is slow at first, then speeds up.
Here’s a simple example. At a 7% average annual return, $10,000 grows to about $76,000 in 30 years and about $150,000 in 40. Those extra 10 years nearly double the result. That’s the value of time, and no extra money was added. (Returns are never guaranteed, and this uses a steady rate for illustration.)
A real-world example
Warren Buffett built Berkshire Hathaway’s Coca-Cola position of 400 million shares between 1988 and 1994 for about $1.3 billion. In 2022, that stake paid Berkshire $704 million in dividends, a 54% annual return on the original cost from dividends alone. The dividend has grown over decades while the cost basis stayed the same.
Why it matters
- Earnings on earnings: Growth builds on prior growth, not just your original deposit.
- Significant long-term growth: Time does much of the work.
- Regular reinvestment: More frequent compounding can speed things up.
- Flexible goals: It applies to retirement, education, and other long-term expenses.
Five rules for making compounding work
- Start early. Time is your biggest asset, and early dollars have the longest to grow.
- Stay consistent. Regular contributions strengthen the effect.
- Think long-term. Withdrawals interrupt the cycle.
- Diversify. Spreading investments reduces the risk of any single failure.
- Be patient. Compounding rewards those who stay invested through the dips.
The key takeaway
You don’t need to be wealthy to build wealth. You need to start early and stay disciplined. Teaching that lesson to 13-year-olds would give them a lifelong advantage.
This is general education, not financial advice.