The Big-Purchase Interrogator: Pressure-Test It Before You Pay
Before you spend real money, let Claude cross-examine the purchase — true cost-per-use, what else that money could do, and whether this is a want dressed up as a need.
You've got the tab open. The thing is in the cart. You've half-decided, and now you're just looking for permission — googling reviews, waiting for a sale, telling yourself you deserve it. The decision is being made by the part of your brain that wants the dopamine hit, and the sensible part is being politely ignored.
The trouble is that big purchases are exactly where a little friction pays off most, and exactly where we apply the least. A rushed $800 decision can be worse than a hundred rushed $8 ones. But "should I buy this?" asked to yourself, at the moment of wanting, almost always returns "yes" — because you're asking the wrong judge.
So appoint a better one. Claude will interrogate the purchase properly: break down what it really costs per use, name what else that money could do, and gently separate genuine need from well-marketed want. Not to talk you out of it — sometimes the answer is a clear, guilt-free yes — but so the decision is made by your judgement instead of your impulse.
What You Need
- A free or Pro account at claude.ai — free tier is fine.
- The purchase in mind: what it is, what it costs, and a rough idea of why you want it.
- Two minutes of willingness to be questioned before you buy.
- Optional: your "Money" Claude Project, so it knows your goals and can weigh the purchase against them.
Step 1: Let it interrogate you
Don't over-explain up front. The value is in the questions Claude asks. Paste this and answer honestly.
You are a sharp, fair-minded financial decision coach. I'm thinking about buying something and I want you to pressure-test it before I do — not to talk me out of it, but to make sure the decision is mine and not my impulse's. The purchase: [WHAT IT IS], costing [PRICE]. Why I think I want it: [YOUR REASON]. Interrogate me. Ask me 4–6 sharp, specific questions, one batch at a time, to get at: how often I'll really use it, whether I already own something that does the job, whether I'm buying the feeling or the function, how I'd feel about it in 3 months, and whether the timing is driven by a genuine need or by a sale/impulse/emotion. Be warm but don't let me off the hook with vague answers. Wait for my answers before drawing any conclusions.
What just happened: instead of you interrogating the internet for permission, something is finally interrogating the decision. Good questions asked at the moment of wanting do most of the work — half the time you'll realise the answer somewhere around question three, before Claude has concluded anything.
Step 2: Run the real numbers
Now the maths that reframes everything: cost-per-use and opportunity cost. This is where an "expensive" thing can turn out cheap, or a "cheap" thing turns out to be a waste.
Based on my answers, run the real economics of this purchase: 1. Cost-per-use: using my honest estimate of how often I'll use it and how long it'll last, calculate the true cost per use. Compare that to how I'd feel paying that amount each time I used it. 2. Opportunity cost: [PRICE] isn't just this thing — what else could that money do for me (against my goals, or invested, or toward something I said I want more)? Make it concrete. 3. Cost of waiting: what's the real downside of waiting 30 days before deciding? Is there a genuine cost, or just the discomfort of delay? Show your working and use my real currency. Keep it honest — if the numbers actually support buying it, say so clearly.
What just happened: the price tag just got translated into two truths you couldn't see from inside the wanting — what it costs every time you use it, and what you're giving up elsewhere to have it. A $600 thing you'll use weekly for years might be a bargain; a $120 thing you'll use twice is the expensive one. The number reframes the feeling.
Step 3: Get the verdict and a rule for next time
Bring it home with a clear recommendation — and turn this one decision into a repeatable filter.
Now give me your honest verdict. 1. A clear recommendation: buy now, wait, buy a cheaper alternative, or skip — with your reasoning in a few plain sentences. 2. If "wait", give me a specific check to run in 30 days to decide (so it's a real pause, not just avoidance). 3. If "buy", give me permission to enjoy it guilt-free and one tip to buy it well (best timing, where, what to avoid overpaying for). 4. Finally, distil this whole conversation into ONE simple rule I could apply to future big purchases, so I don't need to agonise every time. Be direct. I'd rather a clear call I can push back on than a wishy-washy "it depends".
What just happened: you've got a clear verdict you can accept or argue with — and, more valuably, a personal rule you can reuse. The best outcome here isn't just this one good decision; it's a reusable filter (like "anything over $200 gets a 30-day wait" or "I only buy the upgrade if I've maxed out what I own") that makes every future purchase easier.
Bonus: The two-option showdown
When it's not "buy or not" but "which one", make the trade-off explicit.
I'm choosing between two versions of the same purchase: [OPTION A — price and key specs] vs [OPTION B — price and key specs]. Help me decide based on real value, not marketing. For each: what the extra money actually buys me, whether I'll genuinely use the difference, and the cost-per-use of each based on how I'll really use it. Give me a recommendation and name the one feature that should decide it for someone in my situation. Call out any "paying for specs I'll never touch".
Payoff: the upsell to the premium version is where a lot of overspending hides — you came to buy the $400 one and walk out with the $650 one "to be safe". This isolates whether the extra money buys anything you'll actually use, or just peace of mind you're overpaying for.
Bonus: The 30-day cooling-off tracker
For the purchases that warrant a real pause.
Set me up a simple 30-day cooling-off check for [PURCHASE]. Give me 3 short questions to answer now about why I want it and how I feel, then the same 3 questions to answer in 30 days, so I can compare my in-the-moment self with my calmer future self. Tell me what kind of answers would signal a genuine yes versus a passing impulse. Keep it to something I'll actually come back and do.
Payoff: impulse has a short half-life. A structured 30-day check lets your calmer future self make the call — and captures your reasoning at both moments so you can see, in black and white, whether the want survived the wait.
Claude didn't tell you what you're allowed to buy — it asked the questions and ran the maths so that your own judgement, not your impulse, gets the final word. Sometimes the honest verdict is a joyful, guilt-free yes; sometimes it's a "wait", and you'll thank yourself. Either way, you make the call. That's the point: this isn't about spending less for its own sake, it's about spending on purpose. Your money, your life, your decision — just made with a clearer head.
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