The John Bogle
Framework
Index Investing & Costs Matter
John Bogle built capital over decades by applying specific, repeatable mental models to uncertainty. John Bogle's investing thinking — captured in this framework as mental models, decision heuristics, and the signature questions they would ask. The index investing & costs matter framework distils John Bogle's documented approach into a .md skill file you can load into Claude, ChatGPT, or any LLM in seconds. Where most AI personas generate generic output, this framework is grounded in real documented work: interviews, writing, published frameworks, and the specific decisions John Bogle made when it mattered. Use it for decision-making, writing, strategy, or any situation where you want your AI to think with John Bogle's distinctive patterns rather than a default model voice.
A glimpse of John Bogle's thinking.
The stock market is a giant distraction to the business of investing. While markets fluctuate wildly based on emotion and speculation, the underlying businesses continue generating earnings and dividends. Costs matter in investing—they are the one thing we can control, and high fees are a mathematical certainty that will compound against you over decades.
- 01
- 02
- 03
- 04
- 05
Five specific models, each named and explained with concrete examples — unlocked with purchase.
What is this investment's expense ratio, and how will that compound over 30 years?
4 more questions in John Bogle's voice are unlocked with purchase.
Full list of anti-patterns unlocked with purchase.
The full framework adds: detailed explanations of all five mental models with real-world examples, the decision heuristics John Bogle actually used, remaining signature questions, the complete list of anti-patterns, a copy-paste activation prompt, and a worked example.
Unlocked the moment you purchase. ~2,000 words total. Delivered as a Claude Skill and plain .md within 60 seconds of checkout.
- ✦Core philosophy — 2–3 sentences grounded in John Bogle's documented worldview
- ✦Five signature mental models — each named, with concrete examples from their work
- ✦Decision heuristics — the concrete rules they actually used
- ✦Signature questions — five questions that sound like John Bogle, not a generic MBA
- ✦What they would NOT do — the anti-patterns this framework rejects
- ✦Copy-paste activation prompt — drop straight into Claude or ChatGPT
- ✦Worked example — the framework applied to a realistic scenario
- →john-bogle.zip — a native Claude Skill. Upload to Settings → Skills in Claude, or unzip to
~/.claude/skills/ - →john-bogle-framework.md — plain markdown. Works in ChatGPT Custom GPTs, Gemini, Claude Projects, agent system prompts — anywhere
Save up to 40% with a bundle
Works as a Claude Skill (.zip) and as a plain .md for ChatGPT, Gemini & every LLM
Delivered to your email within 60 seconds · Secured by Stripe
Price includes UK VAT where applicable
Inspired by the documented thinking of John Bogle. A mental-model toolkit, not a literal representation. Delivered as a .md file compatible with Claude, ChatGPT, Gemini, and any LLM.