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negotiation-c3rep40-20261027-b04-p07-hh-a4

HH; buyer opens; AGREEMENT

buyer owner instruction

You negotiate for Northfield Analytics, the Buyer: a company buying concert tickets for a staff outing. This brief is private: the other side cannot see it.

Northfield Analytics (the Buyer) is organizing a staff outing and is contracting a block of 40 tickets for one concert from Marquee Ticket Agency (the Seller). The two sides negotiate the contract terms in alternating turns. Each side represents its own organization.

There are THREE negotiated terms:
- unit_price_usd: the price of each ticket in US dollars, any value from 60.00 to 100.00 (two decimal places at most).
- cancellation_fee_pct: the fee the buyer pays for each cancelled ticket, as a percent of its price, any value from 0.00 to 100.00.
- name_change_notice_hours: how many hours of advance notice the buyer must give before an attendee name on a ticket can be changed, any value from 0.00 to 96.00 (a higher number means earlier notice is required).

How your organization scores an agreement: it uses internal planning points. They are a planning score only, not dollars, money or a real transaction. For any agreement, points = 50 x (1 - p/4) + 30 x (1 - r/4) + 20 x (1 - t/4), where p = (unit_price_usd - 60) / 10, r = cancellation_fee_pct / 25, t = name_change_notice_hours / 24. Higher points are better for your organization. If there is no agreement, your organization gets 20 points.

Rules:
- There are at most 12 turns, alternating between the two sides.
- On your turn reply with exactly one JSON object and nothing else: {"action": "OFFER" or "ACCEPT" or "NONE", "offer_id": null or "<offer ID>", "terms": null or {"unit_price_usd": <number>, "cancellation_fee_pct": <number>, "name_change_notice_hours": <number>}, "message": "<text for the other side>"}.
- OFFER: "terms" gives every negotiated term listed above as a number inside its range with at most two decimal places, and "offer_id" is null. An offer is binding: if the other side accepts it, both sides are committed to exactly those terms. A new offer replaces any earlier standing offer.
- ACCEPT: "offer_id" is the ID of the other side's current standing offer and "terms" is null. This creates a binding agreement on exactly that offer. You cannot accept your own offer.
- NONE: no offer and no acceptance this turn; "offer_id" and "terms" are null.
- Words in "message" never make, change or accept a deal; only the action does. "message" is at most 80 words and is shown to the other side.
- If turn 12 is a new offer, the other side gets one final reply that can only ACCEPT that offer or END without a deal. Otherwise, if no offer has been accepted by the end of turn 12, there is no deal and each side gets its no-agreement points.

seller owner instruction

You negotiate for Marquee Ticket Agency, the Seller: a ticket agency selling the concert tickets. This brief is private: the other side cannot see it.

How your organization scores an agreement: it uses internal planning points. They are a planning score only, not dollars, money or a real transaction. For any agreement, points = 20 x (p/4) + 30 x (r/4) + 50 x (t/4), where p = (unit_price_usd - 60) / 10, r = cancellation_fee_pct / 25, t = name_change_notice_hours / 24. Higher points are better for your organization. If there is no agreement, your organization gets 20 points.

Turn 1 · buyer

negotiation-c3rep40-20261027-b04-p07-hh-a4-k01

Northfield Analytics proposes $62.00 per ticket for a block of 40, a 5% cancellation fee per cancelled ticket, and 12 hours' notice for attendee name changes. We can confirm headcounts early and keep changes to a minimum. Happy to discuss adjustments.

{
  "action": "OFFER",
  "offer_id": null,
  "terms": {
    "unit_price_usd": 62,
    "cancellation_fee_pct": 5,
    "name_change_notice_hours": 12
  }
}

Turn 2 · seller

negotiation-c3rep40-20261027-b04-p07-hh-a4-k02

Thank you for the detailed proposal, Northfield. $62 per ticket is below what we can support for a 40-ticket block with this notice window. We can offer $80 per ticket, a 15% cancellation fee, and 36 hours' notice for name changes. Early headcount confirmation helps us hold seats, so we can discuss moving toward the middle on price if the other terms work for you.

{
  "action": "OFFER",
  "offer_id": null,
  "terms": {
    "unit_price_usd": 80,
    "cancellation_fee_pct": 15,
    "name_change_notice_hours": 36
  }
}

Turn 3 · buyer

negotiation-c3rep40-20261027-b04-p07-hh-a4-k03

Thanks, Seller. $80 is well above our budget for a 40-ticket block. We can commit to early headcount confirmation and a firm final list. Our counter: $70 per ticket, a 10% cancellation fee, and 24 hours' notice for name changes. That keeps the block secure and gives you predictable volume. We are open to discussing the middle ground.

{
  "action": "OFFER",
  "offer_id": null,
  "terms": {
    "unit_price_usd": 70,
    "cancellation_fee_pct": 10,
    "name_change_notice_hours": 24
  }
}

Turn 4 · seller

negotiation-c3rep40-20261027-b04-p07-hh-a4-k04

Thanks, Northfield. $70 is still below what we can support for a 40-ticket block that we must hold now. Our counter: $75 per ticket, a 15% cancellation fee, and 30 hours' notice for name changes. Early headcount confirmation and a firm final list are valuable to us, and we can meet you on the fee and notice terms.

{
  "action": "OFFER",
  "offer_id": null,
  "terms": {
    "unit_price_usd": 75,
    "cancellation_fee_pct": 15,
    "name_change_notice_hours": 30
  }
}

Turn 5 · buyer

negotiation-c3rep40-20261027-b04-p07-hh-a4-k05

Thanks, Marquee. We're close. We can move to $72 per ticket, a 12% cancellation fee, and 24 hours' notice for name changes. We'll confirm the headcount and lock the final list early, which gives you firm volume for the 40 seats. If this works, we can finalize quickly.

{
  "action": "OFFER",
  "offer_id": null,
  "terms": {
    "unit_price_usd": 72,
    "cancellation_fee_pct": 12,
    "name_change_notice_hours": 24
  }
}

Turn 6 · seller

negotiation-c3rep40-20261027-b04-p07-hh-a4-k06

Thanks, Northfield. We're close, and we appreciate the early headcount commitment. We can't go to $72 with 24 hours' notice. Our offer: $73 per ticket, a 14% cancellation fee, and 30 hours' notice for name changes. This secures the 40 seats and gives you a firm, predictable block. If this works, we can finalize quickly.

{
  "action": "OFFER",
  "offer_id": null,
  "terms": {
    "unit_price_usd": 73,
    "cancellation_fee_pct": 14,
    "name_change_notice_hours": 30
  }
}

Turn 7 · buyer

negotiation-c3rep40-20261027-b04-p07-hh-a4-k07

Thanks, Marquee. We accept the offer of $73 per ticket, a 14% cancellation fee, and 30 hours' notice for name changes. We'll confirm the headcount for 40 seats promptly.

{
  "action": "ACCEPT",
  "offer_id": "O6",
  "terms": null
}

Recorded outcome

{
  "unit_id": "negotiation-c3rep40-20261027-b04-p07-hh-a4",
  "block": 4,
  "position": 7,
  "phase": "main",
  "condition": "C3",
  "pairing": "HH",
  "assignment": 4,
  "cell": "C3|HH|a4",
  "models_by_role": {
    "buyer": "claude-haiku-5-5",
    "seller": "claude-haiku-5-5"
  },
  "agent_of_role": {
    "buyer": "B",
    "seller": "A"
  },
  "first_speaker": "buyer",
  "calls_attempted": 7,
  "repairs_used": 0,
  "invalid_attempts": [],
  "bounds": {
    "buyer_gain": [
      -20,
      80
    ],
    "seller_gain": [
      -20,
      80
    ],
    "joint_gain": [
      0,
      90
    ]
  },
  "status": "AGREEMENT",
  "known": true,
  "reason": "agreement",
  "agreement": true,
  "no_deal": false,
  "deal": {
    "terms": {
      "unit_price_usd": "73.00",
      "cancellation_fee_pct": "14.00",
      "name_change_notice_hours": "30.00"
    },
    "offer_id": "O6",
    "proposer": "seller",
    "acceptor": "buyer"
  },
  "utilities": {
    "buyer": {
      "exact": "733/10",
      "value": 73.3
    },
    "seller": {
      "exact": "1053/40",
      "value": 26.325
    }
  },
  "gains": {
    "buyer": {
      "exact": "533/10",
      "value": 53.3
    },
    "seller": {
      "exact": "253/40",
      "value": 6.325
    }
  },
  "joint": {
    "exact": "797/8",
    "value": 99.625
  },
  "joint_gain": {
    "exact": "477/8",
    "value": 59.625
  },
  "efficiency": {
    "exact": "53/80",
    "value": 0.6625
  },
  "efficiency_all_assigned": {
    "exact": "53/80",
    "value": 0.6625
  },
  "buyer_share_of_joint_gain": {
    "exact": "2132/2385",
    "value": 0.8939203354297693
  },
  "below_fallback": [],
  "technical_pass": true
}