PETROS

PETROSPETROSPETROS

PETROS

PETROSPETROSPETROS
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    • The Book
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    • Home
    • Bitcoin Education
      • First Steps
      • Bitcoin Basics
    • Financial Literacy
      • About FinLit
      • FinLit Spring 26
      • FinLit Winter 24 to 25
      • FinLit Winter 23 to 24
      • FinLit Winter 22 to 23
      • The Book
  • Home
  • Bitcoin Education
    • First Steps
    • Bitcoin Basics
  • Financial Literacy
    • About FinLit
    • FinLit Spring 26
    • FinLit Winter 24 to 25
    • FinLit Winter 23 to 24
    • FinLit Winter 22 to 23
    • The Book

Money is the one subject school forgets to teach.

Mr. 401(k)'s Principles of Financial Literacy is a plain-English guide to money, markets, and the modern economy, written for teenagers and young adults, and for the parents and teachers who guide them.

Buy on Amazon: Coming Soon

What It Is

 Most money books jump straight to budgets and tips. This one starts with a better question: what is money, really? Once that clicks, the paycheck, the credit card, the index fund, and the mortgage all begin to make sense.

Every claim is shown with the math, so you never have to take a number on faith. And the book is careful never to oversell. It shows the full retirement number, then walks it back to what it is really worth in today's dollars. That kind of honesty runs through every chapter.

What's Inside

The book builds real understanding one plain-English chapter at a time:

  • How money gets its value, and why prices and the money supply keep rising
  • The three ways to make money, and which one builds lasting wealth 
  • Budgeting, taxes, and the difference between what you earn and what you keep 
  • Assets, debt, net worth, and how banks actually create money 
  • Bitcoin, explained honestly: what it is, how it works, and what to make of it 
  • Inflation, interest, and the most powerful force in finance: time 
  • Whether college is worth its cost, run as real numbers 
  • How to start investing, choose funds, avoid fees, and use retirement accounts 
  • A step-by-step business-plan project that puts the whole book to work 
  • And the whole plan on one page, small enough to copy onto an index card 

Who It's For

Teens and young adults facing a first paycheck, a first credit card, or a first benefits packet

 Parents who want their kids to learn this early, instead of the hard way at forty

Teachers and homeschoolers who want a real curriculum, not another worksheet

For Educators

Built in a classroom. Ready for yours.

The book is mapped, benchmark by benchmark, to the National Standards for Personal Financial Education from the Council for Economic Education and the Jump$tart Coalition, and it covers all six national topic areas: earning, spending, saving, investing, managing credit, and managing risk. With its capstone business-plan project, it works as a ready-to-teach unit, not just a reading.

A free companion guide for teachers and parents includes the full standards map, discussion prompts, and the one-page plan.

Files coming soon.

Born in a Real Classroom

This book did not start as a book. It started as a course.

Since 2022, Petros has volunteered teaching financial literacy to middle school students, where his students know him as Mr. 401(k). The book grew out of that classroom, and the course itself remains free and openly licensed for any teacher, parent, or student who wants it.

Explore the FREE Course

About the Author

Petros Koumantaros has spent his career helping working people build secure retirements. He has testified before the United States Senate on improving retirement savings, serves as a Governor-appointed member of Washington State's Washington Saves Governing Board, and teaches financial literacy to teenagers as Mr. 401(k). He wrote the book he wishes someone had handed him at fourteen.

More About Petros

Learn it. Earn it. Own it. Grow it.


If you want the head start no one gave you, start here.

PETROS

Copyright © 2026 PETROS. FinLit with Mr. 401(k) curriculum materials (PDFs/handouts) are licensed CC BY 4.0 unless otherwise noted. All other website content is All Rights Reserved.