Concept explainers & how-to guides
Ideas posts answer specific financial questions by drawing on the full Wealth Shelf library — not just a single book. Clear, grounded, and built to be actionable.
How to Start Investing in Your 20s: A Step-by-Step Guide
Which accounts to open, what to buy, how much to contribute, and the six mistakes that cost young investors the most. Everything in sequence — from zero to investor.
What Is Compound Interest? The Math That Makes — and Breaks — Financial Lives
The Rule of 72, the real cost of delay, and how the same mathematical process that builds wealth on investments destroys it on high-interest debt.
What Is Dollar-Cost Averaging? The Strategy That Works Because It Removes the Decision
What DCA actually does, why it works, and the honest counterargument — lump sum beats DCA mathematically — that makes the real case for it even stronger.
Index Funds vs. Active Management: What Does the Evidence Actually Say?
Four decades of data from Bogle, SPIVA, DALBAR, and Malkiel — and an honest account of what it does and doesn’t prove about picking funds and stocks.
How Much Do I Need to Retire? The 25x Rule Explained
Where the 25x rule comes from, how to calculate your number, and the adjustments that make it more reliable for longer time horizons and different income situations.
Is It Too Late to Start Investing at 30? The Honest Answer (Plus a Plan)
The real cost of a ten-year delay, a catch-up calculator with your own numbers, net worth benchmarks by age, and a specific eight-step plan — whether you’re starting at 30, 35, or 40.
What Is a Good Savings Rate? The Number That Matters More Than Your Returns
Your savings rate is a bigger lever than your investment returns — especially in the first decade. Here’s what the data from millionaire households shows, and how to build toward it.
What Is Conscious Spending — and Does It Work?
Ramit Sethi’s alternative to traditional budgeting: spend freely on what you love, cut ruthlessly on what you don’t. The framework, the math, and an honest assessment of when it works.