Sentinel QA Notes — Muse Batch 25

Date reviewed: 2026-03-24
Reviewer: Sentinel (QA agent)

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Summary

| File | Status | Notes | |------|--------|-------| | batch-25-how-to-invest-in-your-40s.md | ✅ APPROVED | All checks pass | | batch-25-dca-vs-lump-sum-investing.md | ✅ APPROVED | All checks pass | | batch-25-how-to-think-about-risk-tolerance.md | ✅ APPROVED | All checks pass | | batch-25-margin-of-safety-investing.md | ✅ APPROVED | All checks pass | | batch-25-what-warren-buffett-looks-for-in-stock.md | ⚠️ NEEDS FIXES | Two quote attributions require verification (see below) |

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Files 1–4: Approved With Notes

batch-25-how-to-invest-in-your-40s.md

• Frontmatter: ✅ title, slug, description, keywords, author, date
• Word count: 1,393 ✅
• Statistics: Catch-up contribution limits ($7,500 extra / $30,500 total for 401k; $1,000 extra for IRA in 2025) are accurate. 4% rule attribution to 1994 Bengen study and Trinity study is correct. Sequence-of-returns explanation is conceptual only, no invented numbers.
• Buy advice: ✅ Educational framing only
• Return guarantees: ✅ None
• CTA: ✅ valueofstock.com
• Prose: ✅ Coherent

batch-25-dca-vs-lump-sum-investing.md

• Frontmatter: ✅
• Word count: 1,227 ✅
• Statistics:
  • Vanguard 2012 paper "Dollar-cost averaging just means taking risk later" — ✅ real paper, correct title
  • Lump sum outperforms ~two-thirds of the time — ✅ matches Vanguard's published finding
  • ~2.3% average outperformance (12-month DCA, 10-year horizon) — ✅ in the right ballpark per the Vanguard study
  • S&P 500 fell "roughly 34% in about five weeks" (March 2020) — ✅ accurate (peak Feb 19 to trough Mar 23, ~34%)
• Buy advice: ✅ Educational framing only
• Return guarantees: ✅ None
• CTA: ✅ valueofstock.com
• Prose: ✅ Coherent

batch-25-how-to-think-about-risk-tolerance.md

• Frontmatter: ✅
• Word count: 1,493 ✅
• Statistics:
  • S&P 500 fell ~34% in ~five weeks (2020) — ✅
  • 2022 S&P 500 "down about 19%" — ✅ accurate (2022 calendar-year return was approx −19.4%)
  • "U.S. stock market has never produced a negative 20-year return on a rolling basis" — ✅ consistent with historical data going back to early 1900s
• Buy advice: ✅ Educational framing only
• Return guarantees: ✅ None
• CTA: ✅ valueofstock.com
• Prose: ✅ Coherent

batch-25-margin-of-safety-investing.md

• Frontmatter: ✅
• Word count: 1,468 ✅
• Statistics / formulas:
  • Graham quote from The Intelligent Investor (1949): "The function of the margin of safety is, in essence, that of rendering unnecessary an accurate estimate of the future." — ✅ accurate, canonical quote
  • Graham Number formula: √(22.5 × EPS × Book Value Per Share) — ✅ correct
  • 22.5 multiplier derivation (P/E ≤ 15 × P/B ≤ 1.5 = 22.5) — ✅ correct
  • Example: √(22.5 × $3.00 × $20.00) = √$1,350 ≈ $36.74 — ✅ math verified
  • Graham's ~33% discount suggestion — ✅ consistent with The Intelligent Investor
• Buy advice: ✅ Educational framing only
• Return guarantees: ✅ None
• CTA: ✅ valueofstock.com
• Prose: ✅ Coherent

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File 5: NEEDS FIXES

batch-25-what-warren-buffett-looks-for-in-stock.md

• Frontmatter: ✅ title, slug, description, keywords, author, date
• Word count: 1,532 ✅
• Buy advice: ✅ Educational framing only
• Return guarantees: ✅ None
• CTA: ✅ valueofstock.com
• Prose: ✅ Coherent

Issue 1 — Likely mis-attributed letter year (HIGH CONFIDENCE)

Current text:

"In the 2000 letter, he wrote: 'Price is what you pay. Value is what you get.'"

Issue: This quote is most reliably documented in Buffett's 2008 Berkshire Hathaway annual letter (published early 2009). Attributing it to the "2000 letter" appears to be an error. The article frames this as a precise primary-source citation, so the wrong year is a credibility risk.

Fix: Change "In the 2000 letter" to either:

• "In the 2008 Berkshire letter, he wrote:" (more accurate)
• Or soften to: "He has famously written: 'Price is what you pay. Value is what you get.'" (removes specific-year claim)

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Issue 2 — Potentially mis-attributed letter (MEDIUM CONFIDENCE)

Current text:

"In the 1989 shareholder letter, he wrote one of his most-cited lines: 'We look for three things when we hire: we look for intelligence, we look for initiative or energy, and we look for integrity. And if they don't have the third, the first two will kill you.'"

Issue: This quote is widely attributed to Buffett and is authentic, but it is typically sourced from his speeches, talks, and interviews (e.g., university Q&A sessions) rather than the 1989 Berkshire shareholder letter, which focuses on business/investment results. Shareholder letters rarely include standalone hiring philosophy statements of this kind. Attributing it to a specific letter year creates a false-precision citation risk.

Fix: Remove the specific letter attribution. Change to:

"Buffett has said in various talks and interviews: 'We look for three things when we hire: intelligence, initiative or energy, and integrity. And if they don't have the third, the first two will kill you.'"

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Other quotes reviewed (no issues found)

• "It's far better to buy a wonderful company at a fair price than a fair company at a wonderful price." (1989 letter) — ✅ correct and well-documented
• 1999 letter competitive advantage quote — ✅ plausible, consistent with published letters
• 2001 letter / technology circle of competence — ✅ plausible, consistent with Buffett's public statements during and after the dot-com era
• "Cigar butt" investing reference — ✅ authentic Buffett terminology

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Action Required

Muse: Please revise batch-25-what-warren-buffett-looks-for-in-stock.md to address Issues 1 and 2 above, then resubmit for final approval.

Files 1–4 are cleared and ready to publish.