PromptSharp › Daily briefs › October 20, 2026

PromptSharp Daily · free web issue · #123

Prompt of the day

October 20, 2026 · the free cross-vertical sampler: get better at AI and prompting, and see the sharpest prompts from across the network. Today's comes from CPG.

CPG Data & InsightsFREE

Share-loss forensics: who is taking it, where, and with what lever

Share is slipping and the meeting is Thursday. Build the suspect list and the confirmation plan before opinions fill the vacuum.

You are a competitive insights analyst running a share-loss investigation. I will paste my share trend and whatever cuts I have (retailer, region, segment, price tier, competitor set). Produce:

A) A SUSPECT TABLE, ranked by likelihood: competitor, where the loss is visible in my cuts, the lever they appear to be using (price, promotion, distribution, innovation, media), and the evidence status — shown in my data vs hypothesis.
B) The THREE sharpest confirmation cuts to run next, each with what a positive result looks like.
C) A 3-sentence EXECUTIVE SUMMARY that clearly separates what is confirmed from what is still hypothesis, so nobody leaves the meeting quoting a guess as a fact.

My data: [PASTE: share trend by period, cuts available, competitor list, anything known about competitor activity]

Rules: Do not invent, estimate, or extrapolate any figure — if a number is not in the data I give you, write "not provided" and flag it. Mark every claim I should verify against my syndicated data or internal reporting before using it externally. Never include retailer-confidential terms or personally identifiable shopper data.

Why it works — Share-loss meetings run on anecdote unless someone shows up with a ranked suspect list and an evidence column. The confirmed-vs-hypothesis split is the discipline that keeps a forensic read from becoming the office rumor mill with a chart on it.

Use AI today — a workflow to steal

WorkflowFREE

Ask AI to grade its own answer and redo it as a 10

Models settle for 'good enough' on the first pass. One self-critique loop routinely lifts quality more than a longer original prompt.

After any output you find just okay, reply: 'Rate that 1-10 against what a top expert would produce, explain the gap, then rewrite it as a 10.'
  1. Get the first draft.
  2. Send the rate-and-improve line.
  3. Repeat once more if needed.

Sharpen it: Tell it what NOT to do. 'No corporate jargon,' 'don't hedge,' 'no bullet points' — negative constraints shape output as much as positive ones.

Elsewhere in the network today

Two professional briefs and one personal brief, plus one for students, rotating daily — every one of them free to read right now.

Live · free daily issue

Sales

Today in Sales: Rebuild the ICP from your own last four quarters, not the deck from 2024

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Consulting & Strategy

Today in Consulting & Strategy: Day-one answer memo: write the hypothesis first, then design the work to break it

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Focus & Productivity

Today in Focus & Productivity: Plan the week in twenty minutes: fixed commitments, three outcomes, and real buffer

Live · free daily issue

Students

Today in Students: Source notes with the citation attached: never lose where an idea came from

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What Happens When Everyone Has a Health Expert in Their Pocket? | OpenAI’s…

Pressure-test your planning assumptions against this. Even if it's not your job to trade on it, leaders who track the AI/macro picture make better hiring, budget, and timing calls than peers who…

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