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fair-split

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Divide things that cannot be divided — an inherited house, a dissolved partnership, the furniture after a breakup — using sealed-bid fair division (Knaster), computed by the bundled script so everyone ends provably above their own fair share. Use when asked to split an estate fairly, divide assets between siblings or ex-partners, who gets the house and what do they owe the others, or handle unequal shares. Produces the sealed-bid procedure, the computed allocation with exact cash transfers, the per-person fairness proof, and the presentation script. Math for the family meeting; not legal advice.

plugins/pm-calculators/skills/fair-split/SKILL.md

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# Fair Split

The house cannot be cut in three, everyone valued it differently, and the sibling who wants it least still resents the one who got it — that is how estates turn into estrangements. Sealed-bid fair division (the Knaster procedure) fixes the structural problem: each person privately states what every item is worth *to them*, each item goes to whoever values it most, and cash transfers rebalance so that every single person ends up — by their own numbers — with more than their fair share. The person who wanted nothing gets paid; the person who got the house pays for the privilege at their own valuation. The bundled script does the arithmetic exactly, supports unequal entitlements (a 50/25/25 will, a 60/40 partnership), and proves the outcome to each participant in their own terms.

## What This Skill Produces

- **The procedure to run** — how to collect sealed valuations so they are honest: privately, simultaneously, before anyone knows the mechanism rewards sincerity
- **The computed allocation** — who gets each item and the exact cash each person pays or receives, from the script
- **The proof of fairness, per person** — each participant shown ending above *their own* valuation of their fair share, which is the sentence that ends arguments
- **The presentation script** — how to explain the result to people who are grieving, angry, or both
- **The edge-case handling** — the item someone cannot afford to win, the sentimental object, the participant who refuses to play

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