Finance & Banking · Personal Finance

Compound Interest in Action — The 30-Year Decision You Make at 18

A numerical-playground lab where teens manipulate inputs of compound interest — start age, contribution, rate, fees — to develop felt intuition for exponential growth, the cost of waiting, and the frictions that erode the textbook outcome.

3 rounds Undergraduate English, Español
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Who it is for

An introductory simulation that assumes no prior knowledge of the subject, designed for undergraduate courses. It also works in vocational and high-school programmes and in onboarding sessions.

How a session runs

  1. The instructor creates a session from the Eureka dashboard and invites the participants.
  2. Participants play 3 rounds. In each one they submit their decisions and the simulation calculates the results. The first round opens with: The Curve.
  3. The simulation can be run in English, Español.
  4. The instructor follows each participant's progress and results from the dashboard, and uses the class results for the debrief.

Decisions participants make

The decisions participants make during the simulation:

  • Monthly contribution (€)
  • Annual real return (%)
  • Years
  • Your guess of the final balance (€)
  • Start age
  • Monthly (€)
  • Retirement age (both)
  • Annual fee (%)
  • Add a 5-year inflation surprise (real return drops to 0% during the stretch)
  • Withdraw €15,000 at age 25 to buy a car

What participants track

What participants follow on screen as the rounds go by:

  • Your Runs
  • The Curve

Subjects covered

Designed for courses in Personal Finance.

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