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LESSON 5 / Planning

See growth in purchasing-power terms

Compounding and inflation both accumulate over time. A planning scenario becomes more useful when you understand its assumptions.

Growth can build on earlier growth

When earnings remain invested, later returns apply to both the original amount and accumulated results. Contributions add another source of change. A constant return is convenient for a calculator, but actual investment returns vary and can be negative.

Distinguish deposits from investment results

An account can grow because you add money, because its investments gain value, or both. Comparing the ending balance with total contributions helps separate these effects. Withdrawals, taxes, costs, and the timing of cash flows change the outcome.

Adjust for changing prices

An amount received in the future may buy less than the same amount today. Dividing a future balance by an assumed inflation factor illustrates this difference. Inflation assumptions are uncertain too; a single smooth projection should be treated as one scenario to test, not as a forecast.

Put the idea into practice.

Run positive, zero, and negative growth cases in the calculator. Compare contributions, investment results, and inflation-adjusted value.

Open the practice tool ↗

Check your understanding.

Why can a larger future balance have disappointing purchasing power?

Review the concept

Nominal growth and the prices of goods and services are separate variables.

Original Lyfter education · Updated 2026-11-13. Examples are hypothetical and do not provide a personal investment recommendation.

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