Big Purchase Negotiator
One number: out the door. Negotiate one number, the out-the-door total, and never let price, trade-in and financing into the same sentence.
What this persona helps with (Core Capabilities)
- ◆Converts any monthly payment quote back into a full out-the-door total
- ◆Defuses the four-square worksheet by separating price, trade and financing
- ◆Sets the written maximum and the walk-away number before the visit
- ◆Enforces the no-signature and 72-hour add-on rules at the finance desk
- ◆Requests two competing written quotes on the same trim and terms
How it works proactively — without waiting to be asked
Converts a monthly payment into an out-the-door number the moment one is mentioned
Sets the walk-away number before a weekend or end-of-quarter sale the user mentions
Triggers the 72-hour add-on rule as soon as the finance office enters the conversation
Install in 60 seconds
- 1Copy the system prompt above with one click.
- 2Paste it into a Claude Project, ChatGPT Custom Instructions / Custom GPT or a Gemini Gem. (You can also just paste it as the first message in a new chat.)
- 3Open it on your phone before you walk into the dealership. Fix the out-the-door number first, then hold the 72-hour rule on every add-on.
A sample dialogue in practice
The Full System Prompt
1094 words · Ready to use right away
Methodology & LLM Verification
This prompt is engineered for high precision on GPT-4o, Claude 3.5 Sonnet and Gemini 1.5 Pro. It uses Chain-of-Thought, few-shot prompting and strict role framing.
Frequently Asked Questions (FAQ)
What exactly does the Big Purchase Negotiator prompt specialize in?+
Converts any monthly payment quote back into a full out-the-door total Defuses the four-square worksheet by separating price, trade and financing Sets the written maximum and the walk-away number before the visit Enforces the no-signature and 72-hour add-on rules at the finance desk Requests two competing written quotes on the same trim and terms
How do I put this persona to work every day?+
Copy the prompt and add it to a Claude or ChatGPT project. The persona is tuned for 30 min of focused interaction.
Is access to the persona free?+
Yes. All 250 prompts in SUPERMIND are 100% free and open to use.
Does it replace professional advice or therapy?+
No. It is a tool that supports self-reflection, productivity and strategic thinking. It does not replace medical, legal or financial advice from a professional.
How do I capture the manufacturer incentive without revealing my budget?+
Ask for the out-the-door total twice: once before the incentive and once after, both in writing. Manufacturer money is public, so you are asking for arithmetic, not a favor. Never state your maximum, your monthly target, or that you are paying cash before the priced offer is on paper, because each of those details is a lever the desk can pull in another corner of the worksheet.
Is the extended warranty worth buying at the finance desk?+
Not there. Nothing gets bought in the finance office, and the rule is 72 hours. Note the three items pitched, take the printed prices, and decide within three days. Paint protection, extended warranties, and tire packages typically cost 40 to 70 percent less from an outside vendor, and the manufacturer's own extended plan can often be bought later from any dealer at a lower price.
How much profit is fair for the dealer to make?+
On a new car, 3 to 6 percent over invoice before manufacturer incentives is a reasonable range, and you can pay it without feeling cheated. The problem is never the first profit, it is the second one hidden in the trade allowance or the financing rate. Confirm the invoice or wholesale figure from a public source, subtract the incentive, and negotiate the out-the-door number against that baseline, not the sticker.
The dealer says the price is only good today. What do I say?+
You say no, once, and ask for the written out-the-door offer with an end date. A price that expires when you leave the room is a script, not a market condition, and such offers are almost always still available next week. The rule is absolute: no signature on the first visit, one night minimum, one second appointment. Walking out is free and it is the strongest move in the store.
Should I mention my trade-in early in the conversation?+
Never in the same conversation as the price. Fix the price in writing first, then ask for the trade as a separate written offer, and bring one instant online offer plus one second-dealer bid to compare against it. When both numbers are named in the same sentence, a generous-looking allowance quietly absorbs the discount you just negotiated, and you cannot tell afterward which number was real.
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