06 Level 2 · Math & Market · Free lesson

The cost of doing nothing.

Leaving money in savings feels safe. But inflation doesn't wait for you to decide. Same paycheck, same $300 a month, two very different futures. Let's put them side by side.

10 slidesInteractiveAbout 25 minutes
Future A · left in savings$47,668at 65, in today's dollars, earning 0.38%
Future B · put to work$241,396at 65, in today's dollars, at an Example 7%

Example $300 a month from age 25 to 65, $144,000 put in either way, 3% inflation. Returns aren't guaranteed.

Education, not personal financial advice. Nothing here tells you what to buy. For your own situation, talk to a licensed fiduciary.

The hook

“Safe” money can still lose.

Put $10,000 in an average savings account and leave it alone for 20 years. The balance grows a little. What it can buy shrinks a lot, because prices grow faster than the interest.

Average savings rate (FDIC, Oct 2026)0.38%
Prices, 12 months to Sep 2026 (BLS)3.7%
Example $5,970 What $10,000 left 20 years at 0.38% can buy, in today's dollars, if prices rise 3% a year. The balance says about $10,790.

Savings rate: FDIC national average, Oct 2026. 3% is close to the 2.99% U.S. average, 1926 to 2026 (officialdata.org). Math in facts.

Nominal vs. real

Real return is what you actually keep.

Your statement shows one number. What matters is a different one. Tap each card, then try the mix below.

Real return ≈ nominal return − inflation A shortcut. The exact version: (1 + nominal) ÷ (1 + inflation) − 1. Lesson 11 goes deeper.

What your money earns
Inflation
Real return, about0%

Rates: FDIC national average and top high-yield savings, Oct 2026; 7% is an Example, not a promise. Exact real return: .

Why “safe” cash loses

Cash is safe from swings, not from inflation.

Cash has a real job: your emergency fund and money you'll need soon. Keep that. It just isn't built to grow for decades. Tap through where money can sit.

Pays
0%
After 3.7% inflation
≈ −3.7%a year
Good for
A little cash on hand for this week.
Watch out
Loss, theft, fire, and the full force of inflation. $10,000 buys about $5,540 of today's stuff after 20 years at 3%.
Pays
0.38%national average, FDIC, Oct 2026
After 3.7% inflation
≈ −3.3%a year
Good for
Easy access, and FDIC insurance up to the limits.
Watch out
The average rate sits far below inflation, so the money buys less every year it sits.
Pays
≈ 4.3%top high-yield savings, Oct 2026
After 3.7% inflation
≈ +0.6%right now
Good for
An emergency fund and money you'll need within a few years. Safety is its job.
Watch out
The rate can drop any time, and interest is taxed as income. Barely ahead of inflation today, not a growth engine.
History, 1926–2026
≈ 10.5%a year, S&P 500 with dividends
After inflation
≈ 7.3%a year
Good for
Money you won't need for many years, so you can ride out the drops.
Watch out
Big swings. The S&P 500 fell 19% from Feb 19 to Apr 8, 2025, then hit a new high by Jun 27. Past results don't guarantee future ones.

FDIC, Oct 2026; officialdata.org S&P 500 since 1926; DALBAR 2026 QAIB; BLS CPI Sep 2026. Real returns use the shortcut.

Try it · Two futures

Your two futures, side by side.

Future A: the money sits in savings at 0.38%. Future B: the same money is invested at an Example 7% a year. Both shown after 3% inflation, so you see what the money could buy.

Show it in

Yours to set: how much you put in and for how long. Not yours: the return. So move the sliders you control, and treat Future B as an Example, not a forecast.

Example Savings at 0.38% (FDIC average, Oct 2026). Invested at 7% a year, an Example long-run rate. Inflation 3%. Real markets jump around; Future B's line would be bumpy, and returns aren't guaranteed.

Future A · savings$0
Future B · invested$0
The cost of doing nothing$0You put in $0 either way

Future B: invested, Example 7%Future A: savings, 0.38%The gap
Checkpoints
AgeABGap

The proof

Doing nothing is a decision too.

Same $300 a month from 25 to 65. Same effort, same sacrifice. The only difference is where the money sits.

7.3% S&P 500 yearly return after inflation, 1926–2026, dividends reinvested (about 10.5% before inflation). $100 in 1926 grew to about $2.27 million.

officialdata.org, S&P 500 since 1926, Oct 2026. Past results don't guarantee future ones.

You put in$300 × 12 × 40$144,000
Future Asavings at 0.38%$155,494
Future Binvested at an Example 7%$787,444

That's in future dollars. After 3% inflation, here's what each could buy:

Future A≈ $47,700in today's dollars
Future B≈ $241,400in today's dollars

The Example 7% sits below the S&P 500's 10.5% history on purpose: fees, taxes, bonds in the mix or a weak few decades could all mean less. Read any projection as a range, not a promise: at an Example 5% to 9%, Future B buys about $140,000 to $431,000 of today's stuff. Future A's balance barely tops the $144,000 put in, and it buys only what about $47,700 buys today.

Sort it

Beats inflation, or loses to it?

Sort each one by how it has tended to do over long periods. Some depend on the details. The explanation tells you when.

Check yourself

Two quick questions. 0 / 2

Your savings pays 0.38% and prices rise 3.7%. Your real return is about…

In the Two Futures example, both put in the same $300 a month. Why does Future B end up so far ahead?

Your move

Do these this week.

You don't have to buy anything today. You do have to stop letting “later” decide for you.

0%

0 / 5 done

Lesson 06 · Done

Doing nothing is still a choice, and inflation makes it a costly one.

  • Real return ≈ nominal return − inflation. Savings at 0.38% with prices up 3.7% is about −3.3% a year.
  • Cash has a job: emergency fund and near-term money. Long-term money needs a job that can beat inflation.
  • $300 a month for 40 years: about $48K vs. $241K in today's dollars (Example: 0.38% vs. 7%, 3% inflation). You control how much and how long; the return is a range, not a promise.

Stewardship moment

25And I was afraid, and went and hid your talent in the ground. Look, there you have what is yours.’ 26“But his lord answered and said to him, ‘You wicked and lazy servant, you knew that I reap where I have not sown, and gather where I have not scattered seed. 27So you ought to have deposited my money with the bankers, and at my coming I would have received back my own with interest.
Matthew 25:25–27 · NKJV

For this lesson: the servant played it “safe” out of fear and handed back exactly what he was given. Even the simplest step would have earned something. Burying it was a choice, and it cost him.

This free lesson is one of 20 in EverOwn Wealth Academy. Next: compound growth, how the market works, index funds, and your own written plan.See what's in the full academy →

One-page cheat sheet ↗
Sources (checked Oct 2026)

FDIC, national rates and rate caps: national average savings rate 0.38% (Oct 2026). Top high-yield savings around 4.3% (Oct 2026).

BLS, Consumer Price Index, September 2026 (released Oct 14, 2026): prices up 3.7% over 12 months.

officialdata.org, U.S. inflation since 1926 (BLS CPI), 1926 to 2026: about 2.99% a year; $1 in 1926 = $19.04.

officialdata.org, S&P 500 since 1926: $100 in 1926 → about $2.27 million by 2026 with dividends reinvested, 10.47% a year; 7.29% after inflation (2026 not yet final).

DALBAR, 2026 Quantitative Analysis of Investor Behavior: S&P 500 fell 19% from Feb 19 to Apr 8, 2025; new high Jun 27, 2025.

Matthew 25:25–27 (NKJV), Biblia, checked against Blue Letter Bible's NKJV text.

Worked examples (Two Futures, the 5% to 9% range, $10,000 for 20 years, $300 a month for 40 years) are EverOwn's own math, checked by hand. Examples, not promises.

Education, not personal financial advice. Past results don't guarantee future ones. Scripture taken from the New King James Version®. Copyright © 1982 by Thomas Nelson. Used by permission. All rights reserved.