One-page note on why shampoo comes in sachets as well as bottles

Many people buy shampoo sachets even when a bottle works out cheaper per wash. The note has to explain why, from the shopper's side, and then say what the brand risks and when it should nudge people towards the bottle instead.

• What is the cost per wash of a sachet and a bottle at one local shop, and what did you assume about how much one wash uses?
• What did two family members say about the last time they bought a sachet?
• Which reasons are about money in hand, which about space, and which about trying something new?
• Who loses if a shopper stays on sachets forever: the shopper, the brand or the environment?

One page with three reasons people buy sachets, each backed by your price working or a family member's words, one clear risk for the brand, and one specific situation where you would push the big pack, with assumptions stated.

Assuming sachet buyers are simply making a mistake. The point is to understand the sense in their choice before suggesting anything.

• Printed prices and pack sizes for one shampoo in sachet and bottle form at one shop on one day
• Your own assumption about how much shampoo one wash uses, written down
• Short notes from two family members on their last sachet purchase, without names

AI must not supply prices, sales shares or survey findings about sachet buyers. Every number comes from your shop visit, and every reason comes from your family's words or your own reasoning, labelled as such.

1. 3.1 Work out cost per washGOOGLE SHEETS

   Why this tool: A sheet shows the calculation openly so a reader can change your assumption about wash size.

   Put the pack size, printed price and your wash-size assumption in separate labelled cells. Calculate washes per pack and cost per wash for each. Do not type numbers inside formulas.

2. 3.2 Sort the reasonsCLAUDE CHAT

   Why this tool: Claude can help you group what your family said into clear reasons without adding new ones.

   Paste your notes and your cost result. Ask for groupings only, then choose your three reasons yourself.

   Prompt to copy · fill in the [brackets]Copy

   Here are my notes from asking two family members about buying shampoo sachets, and my cost-per-wash result:
   [paste notes and result]
   Group what they said into possible reasons, such as cash in hand, storage or trying a product. Quote the note behind each group. Do not add reasons that are not in my notes; instead list them separately as questions I could still ask.

3. 3.3 Face the sceptical shopkeeperCLAUDE CHAT

   Why this tool: Playing a sceptic tests whether your reasons hold up against someone who sees sachet buyers every day.

   Give Claude your three reasons, your brand risk and your big-pack situation. Answer each objection in your own words and change the note where an objection lands.

   Prompt to copy · fill in the [brackets]Copy

   Play a sceptical shopkeeper who sells many shampoo sachets. Here are my three reasons people buy them, one risk for the brand, and one situation where I would push the bottle:
   [paste your draft points]
   Challenge each point in one or two sentences, the way a shopkeeper would. Then tell me which point is weakest.

• Recompute cost per wash for both packs by hand from the printed prices
• Your wash-size assumption is written in the note, so a reader knows what it rests on
• Each reason links to a family member's words or to your calculation
• The big-pack situation is specific, such as a family that washes hair daily, not just 'when it is cheaper'
• The recommendation follows from the criteria, not the other way round
• The strongest objection is answered in the memo

AI usually offers a neat textbook list of reasons for small packs. Check that each reason in your note actually appeared in what your family told you, or say plainly that it is your own reasoning.

• Cost-per-wash sheet with labelled assumptions
• Three reasons with their source
• One brand risk
• One situation for the big pack
• A line on what the sceptical shopkeeper changed

A one-page note: the cost comparison in a small box at the top, three reasons as short paragraphs, then the risk and the big-pack situation.

Explain one objection from the sceptical shopkeeper that changed your note, and what you learned about judging a choice that looks irrational on paper.