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How I Use a Simple Analogy to Teach Investing

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AUTHOR: Mark Crothers on 8/03/2025

Jonathan Clements, through his decades of work and his recent “Getting Going on Savings Initiative,” has inspired countless people—including me—to think about how to empower the next generation. The initiative’s core mission is to give young adults a tangible head start by funding their Roth IRAs, a concept that perfectly aligns with the most important lesson I’ve ever learned about money: time is a young adult’s greatest asset.

For many years I’ve been that person who talks to younger people about saving for retirement and investing for their future. Through family, friends, church youth groups and my younger employees, I’ve developed a playbook that seems to work more often than not. I’m always thrilled with early success, as the younger someone starts, the better their future investment outcomes tend to be.

I feel an obligation to give advice and build trust with younger generations. Perhaps it’s because of my difficult early financial background. I’m not entirely sure, but if you have ever considered giving financial encouragement about retirement planning, my approach might be helpful. My normal first play is based on this question, asked during an informal chat in a relaxed setting:

“What do you think of this? If I had a machine that let you feed in $1 bills and gave you $20 in exchange, would you be excited?” It’s a no-brainer, and they might ask how it works. I keep it simple and light-hearted, with no details needed. “It’s very simple; there’s a magic spell within the machine called the index tracker investing spell.” I then follow through with another question:

“What if I told you the machine had a timer and only dispensed the crisp $20 note 40 years later? Would you still be happy to swing by every day and pop a dollar in? It’s definitely worth the effort, don’t you think? Your $20 will still buy you the equivalent of $5 in this distant future, but hey, it’s still a spectacular personal win for your wallet.”

This nearly always sparks interest and a conversation about money. The idea is simple and intriguing, and I find it’s a good way to capture young adults’ imaginations. A common question I get asked is, “Is this real?” I normally fire up an online compound interest calculator and get them to play around with it. Finally, I would chat about setting up the right account to feed the money machine.

I would talk about a Roth IRA and the magic of paying no taxes while the money is inside the machine. The even better point is that when you pull out your dollar bills, now transformed into $20 bills, it’s all yours with nothing going to the tax man. At home in the UK I would over time chat about other accounts with different rules and for different goals, unfortunately I’m not familiar enough with your US equivalents to illustrate my point further.

But I think this core principle remains universal: time is a young adult’s greatest asset. It’s the engine that powers the “magic machine. So my hope is that this simple analogy empowers you to spark these conversations yourself. Take a moment to chat with a young person in your life—a family member, a friend, or an employee—and see if you can light a similar spark of financial curiosity. After all, what better gift can we give than a head start on their future?

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Rick Connor
3 months ago

We learned a useful technique in CFP class to quickly calculate the real rate of return considering inflation.

Real Rate of Return = ((1 + Nominal Rate) / (1 + Inflation Rate)) – 1 

Using William Housley’s example below, consider an investment that has a 7% Nominal Return, and the Inflation Rate is 4%.
Putting these values into the above formula gives the following:

Real Rate of Return = ((1 + 0.07) / (1 + 0.04)) – 1 = 1.07 / 1.074- 1 ≈ 0.02885 or 2.9% 

This means that after accounting for inflation, the actual purchasing power increase from the investment is 2.9%. After 10 years a dollar invested would be worth $1.33. 

B Carr
4 months ago

This is truly an excellent approach! Thank you.

William Housley
4 months ago

With a little help from AI for research:

How Much Is a 2025 Dollar Worth Compared to a 2020 Dollar—And What If You Invested at 7%?

1. Inflation Erosion:
From 2020 to 2025, the cumulative inflation in the U.S. has been approximately 22%. That means:

What cost $1.00 in 2020 now costs about $1.22 in 2025.So, a 2025 dollar has the purchasing power of roughly 82 cents in 2020 dollars.In short, your money lost value if it just sat there.

2. Investment Growth at 7%:
Now, let’s say instead of leaving that dollar idle, you invested it at a 7% annual return. Over 5 years, you’d get:

\$1 \times (1.07)^5 \approx \$1.40

That means your investment grew 40% over the same period.

3. Real Return (After Inflation):
To understand how much you really gained, compare your $1.40 investment result to the $1.22 inflation-adjusted value:

\$1.40 / \$1.22 \approx 1.15

So even after inflation, you’re ahead by about 15% in real purchasing power.

Bottom Line:

Doing nothing: your money buys 18% less.Investing at 7%: your money buys 15% more.That’s a 33% swing in real value—just by choosing to invest rather than let inflation eat away your savings.

Last edited 3 months ago by William Housley
William Housley
3 months ago

Years – Value After Inflation (4%) – Value After 7% Investment -Real Value (Investment ÷ Inflation)
10yrs $1.48 1.97 1.33× (33% real gain)
15 yrs – $1.80 $2.76 1.53× (53% real gain)
20 yrs – $2.19 $3.87 1.77× (77% real gain)
25 yrs – $2.66 $5.43 2.04× (104% real gain)

This may be a better lesson… I put $365 in my grandkids account every year on their birthday into VOO or VTI
Age / Invested / Today Value
3 yrs old / $1095 / $1440
5 yrs old / $1825 / $2577
8 yrs old / $2920 / $5101

Last edited 3 months ago by William Housley
Rick Connor
4 months ago

Nice article Mark. I agree that time is one of our greatest assets. I wrote an article 4 years ago with some similar themes about using our time and human capital to create wealth,

bbbobbins
4 months ago

No just the young either. For everyone at 50 they still have probably near 30 years (and hopefully nearer 40 years) for those $ to compound.

That’s why (in addition to recent low annuity rates) I believe the idea of annuitising retirement savings has fallen out of fashion.

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