What it is
A single slide, early in the deck (typically slide 3 — immediately after the thesis headline), that states in three numbered lines why the thesis is true.
It is the Minto Pyramid Principle made physical: the Big Idea on top, decomposed into three MECE (Mutually Exclusive, Collectively Exhaustive) supporting pillars below.
If a reader closes the deck after this slide, they should still be able to articulate your argument.
Why it works
- The mind handles three. Four+ become a list; two feel thin. Three is the sweet spot memory and rhetoric agree on.
- It pre-empts "what's your thesis?" every reader asks in the first 30 seconds. You give them the answer explicitly.
- It commits you to three specific claims — each of which the rest of the deck must support. This forces disciplined structure.
- It's the most quotable slide. Journalists, analysts and proxy advisors lift these verbatim into their coverage. Design for that.
Canonical structure
Each reason should hit three things:
1. [Gap / diagnosis] — quantified.
2. [Why the market hasn't priced it] — quantified.
3. [Path to realisation + reward] — quantified.
Every reason must be:
- Under 15 words
- Numeric (at least one figure per line)
- Specific (names the KPI, segment, or lever)
- Independent (removing one leaves the other two standing)
Worked examples
Pershing Square · McDonald's (Nov 2005)
- McDonald's real estate is worth ~$46bn, ~94% of enterprise value.
- Separating McOpCo reveals a 60% EBITDA-margin real estate business that re-rates to 12.5–13.5×.
- Leveraged recap + buyback unlocks $45–50/share — 37–52% premium to $33.
Pershing Square · Canadian Pacific (Feb 2012)
- CP has the worst operating ratio of any Class I railroad.
- Under Fred Green, CP returned -18% while peers returned +22% to +93%.
- Hunter Harrison transformed CN into best-in-class — he can do the same at CP.
Starboard · Darden (Sep 2014)
- Darden underperformed direct peers by ~300% over 5 years under current board.
- Operational plan adds $215–326M EBITDA — just 3.8% of current cost pool.
- Sum-of-parts shows $67–86/share vs. $48 — before any Olive Garden turnaround.
Hindenburg · Nikola (Sep 2020)
- The demo video was staged — the truck rolled downhill.
- Founder Trevor Milton has a 20-year history of fraudulent claims.
- No material product exists; the equity is a theatre.
Muddy Waters · NMC Health (Dec 2019)
- Reported cash balance is fabricated — primary documents contradict the filings.
- Related-party transactions have systematically transferred value to the chairman.
- Book equity is significantly negative once adjusted; we remain short.
Trian · Disney "Restore the Magic" (Mar 2024)
- Disney has destroyed >$200bn of shareholder value under the current board.
- The board lacks the operational expertise to fix what they broke.
- Adding Peltz + Rasulo closes the capability gap and refocuses capital allocation.
Design rules for the slide
- Numerals are serif, large. The
1,2,3are visual anchors — render them in 64–100pt serif italic, accent colour, left of each line. - Text is sans, medium weight, 22–28pt. Each reason on one line if possible.
- No bullets below the line. If a reason needs supporting sub-points, move them to the Complication section. This slide is the summit, not the evidence.
- White space above and below. Do not fill the slide. This is a moment; give it room.
- No chart, no icon, no stock image. Three lines of text. The typography IS the design.
Order of the three
A deliberately strategic question. Three ordering patterns recur:
- Diagnosis → Opportunity → Path (most common, e.g. McDonald's 2005)
- Gap → Cause → Remedy (management-change theses, e.g. CP 2012)
- Promise broken → Current state → Required action (short-seller reports alleging fraud, e.g. Nikola)
Pick the order that matches the deck's core thesis type. Fraud exposés almost always lead with the broken promise (#3 ordering); operational turnarounds lead with the gap.
Common mistakes
- Four reasons dressed as three. If reason 2 has a semicolon, you've got two reasons. Merge or move to another slide.
- Qualitative adjectives. "Significant underperformance" is not a reason — "-18% TSR vs. +22–93% peer range" is.
- Reasons that aren't MECE. If reason 1 and reason 2 argue the same thing from different angles, the reader registers it as filler. Ruthlessly MECE.
- Saving the reward for later. The third reason must cash the cheque the first two wrote. Quantify the upside here, not only in the Answer section.
- Starting with the solution. "Spin the real estate" is not reason 1 — it's reason 3. Lead with the gap/diagnosis.
How the skill should produce these
When drafting the three reasons with a user:
- Ask for the Big Idea in one sentence first.
- Draft 5–7 candidate reasons, each under 15 words, each quantified.
- Eliminate duplicates / overlap → collapse to MECE set of 3.
- Order using the pattern match above (diagnosis / gap / broken promise).
- Check each reason against the rest of the deck: does the deck actually prove it? If not, strengthen the evidence in the Complication or cut the reason.
See also
storytelling/scqa-framework.md— the three reasons are the compressed Answer within the SCQA arc.storytelling/narrative-foundations.md— Pyramid Principle derivation.storytelling/closing-ask.md— the three reasons set up the specific ask on the final slide.slides/slide-architecture.md— this is Block 3 of the 8-block structure.