Poor Charlie’s Almanack
What you will learn
Use multiple explanatory models and disconfirming evidence to examine an incentive or claim.
Read and apply
Read the Poor Charlie's Almanack book page (opens in a new tab)
On the book page, choose one idea relevant to the objective above. Write what evidence would support it and what could weaken it. Then complete the filing or source activity below and return to these course questions.
Check your understanding
Choose an answer, then open the feedback.
What is a mental model useful for in this lesson?
A. Replacing all evidence. B. Viewing a decision from more than one angle. C. Guaranteeing a correct prediction.Show answer and feedback
B. Multiple models can expose hidden assumptions, but their conclusions still need evidence.
What is confirmation bias?
A. Seeking only evidence that supports an existing view. B. Checking a claim against a filing. C. Reconsidering a thesis after new facts.Show answer and feedback
A. A counterexample or disconfirming fact is often the more valuable check.
Why might an incentive matter when evaluating a claim?
A. It proves the claim false. B. It removes business risk. C. It can influence what a speaker emphasizes or omits.Show answer and feedback
C. Incentives are a reason to verify the claim, not an automatic verdict.
Why question: Why should a learner write down one fact that could change their mind?
Show a sample explanation
It makes the decision testable and reduces the chance of treating a favored story as settled evidence.
Try a disconfirming-evidence check
Open the prefilled SEC filing search. Open Apple’s prefilled SEC filing search. Choose one positive business claim, then find a risk disclosure in its latest 10-K that could limit that claim. Record the period and both sides.
Key takeaways
- Multiple models can expose hidden assumptions, but their conclusions still need evidence.
- A counterexample or disconfirming fact is often the more valuable check.
- Incentives are a reason to verify the claim, not an automatic verdict.
This activity is for financial education. An example or book framework does not guarantee investment results.
AI responses are for educational purposes. Always verify with official course materials.
This lesson teaches a concept. It is general education, not advice about your money. Before you act on anything you learn here, speak to someone licensed.
Sources and reference material
Primary sources and original reference material for the concepts discussed on this page.
- SEC EDGAR: Apple company filings
- SEC Investor.gov: Behavioral Patterns of U.S. Investors
- SEC and FINRA: Social Sentiment Investing Tools
- died on November 28, 2023
References added 14 October 2026.
AI responses are for educational purposes. Always verify with official course materials.
This lesson teaches a concept. It is general education, not advice about your money. Before you act on anything you learn here, speak to someone licensed.
This lesson teaches a concept. It is general education, not advice about your money. Before you act on anything you learn here, speak to someone licensed.
