Just Keep Buying

Introduction

Nick Maggiulli writes the data-driven blog Of Dollars and Data and works in wealth management. Just Keep Buying, published in 2022, uses data and analysis to answer common personal finance questions, such as how much to save, when to invest and whether to buy a home.

Its title captures his main investing advice: keep buying income-producing assets consistently over time.

Who should read this book?

Readers who like data, young professionals and anyone looking for evidence-based answers to personal finance questions.

Helps with: Get my money right

The central message

Save what you can, focus on growing income, and invest consistently in income-producing assets over the long term.

Key ideas and concepts

1. Save what you can

   Maggiulli argues the right savings rate depends on your situation; when your income is low, saving more is hard, and focusing on income may matter more.

2. Grow your income

   Over time, increasing income has more impact on wealth than cutting small expenses.

3. The 2× rule for spending

   He suggests that if you want to splurge on something, invest an equal amount, which helps reduce guilt.

4. Just keep buying

   Investing regularly, rather than waiting for the perfect time, usually beats trying to time the market.

5. Income-producing assets

   Stocks, bonds, real estate and businesses generate returns over time.

Deeper analysis

Just Keep Buying is refreshingly data-driven and nuanced. Maggiulli challenges common advice, for example showing that when your income is low, earning more matters more than cutting small expenses, and that investing regularly usually beats waiting for a dip. His simple rules, like the 2× rule for guilt-free splurging, are easy to follow, and the book covers saving, spending, investing and housing in short chapters.

It's US-focused, and some analyses rely on historical US market data that may not repeat. The data-heavy approach may feel dry to some readers. Still, it's a smart, practical guide; as always, this is general education rather than personal financial advice.

Practical applications

• Focus on increasing your income this year.
• Set up regular automated investing.
• Use the 2× rule before a big purchase.
• Calculate your savings rate.
• Stop trying to time the market.

Your 7-day action plan

1. Day 1

   Calculate your current savings rate.

2. Day 2

   List three realistic ways to grow your income this year.

3. Day 3

   Set up automatic, regular investing, if appropriate for you.

4. Day 4

   Apply the 2× rule before your next splurge.

5. Day 5

   Learn about the main types of income-producing assets.

6. Day 6

   Review your portfolio or savings for diversification.

7. Day 7

   Reflect on whether you've been trying to time the market.

Outcomes to expect

What readers who apply this book can realistically take away from it:

• Evidence-based money habits
• Focus on growing income
• A habit of consistent investing
• Guilt-free spending rules

Strengths and limitations

Reflection questions

1. Where could you grow your income?
2. Do you try to time the market?
3. How do you decide what to splurge on?
4. What assets do you own?

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About the author

Book details (title, author, year) are factual. Everything under the headings above is MindsetProdigy's own editorial analysis and interpretation, written to help you decide whether to read the book and how to apply it. It is not a substitute for reading the book itself. Last updated September 28, 2026.