Finance for Geeks

Reviewed by Diario de un Inversor · UpdatedJune 13, 2026

Our review

"Finance for Geeks" solves a specific problem that few personal finance books manage: being accessible without being condescending. Jordi Martínez, known online as «Jordi Financiero», uses references to video games, TV series, and pop culture not as decoration but as cognitive scaffolding to explain concepts that typically trigger resistance in younger readers. The structure follows a sensible arc: mindset first, then budgeting, then debt, and finally investing, with index funds as the recommended first destination. The treatment of passive investing — index funds, ETFs, time horizons — is explained with greater clarity and depth than most Spanish-language financial education books achieve. The most legitimate critique is that the humorous tone, while effective as a hook, can dilute the gravity of some financial decisions. There are also passages where the effort to connect with Gen Z produces references that date as quickly as a meme. Published in 2022, the book captures a moment of growing investment interest among millennials and Gen Z in Spain.

Key takeaways

• Index funds allow participation in market growth without selecting individual stocks or paying high management fees.
• Compound interest is the most powerful mechanism for long-term capital accumulation, and its effect multiplies with time in the market.
• Consumer debt — credit cards, quick loans — destroys wealth as efficiently as investing builds it.
• Automating savings removes willpower as a variable in the personal finance equation.

Fact

Published in 2022, the year index funds surpassed actively managed funds in total assets under management in the United States for the first time in history.