Thomas McKinlay’s Post

🎓 How should you write a discount? Use the subtraction principle to boost sales 👇 🔬 Researchers ran 7 experiments and found that when the discounted price was placed to the right (vs the left), people were: - 39.2% more likely to say they would buy a $349.99 Blu-ray player on sale for $239.99 - 2x as likely to choose a wooden spoon - 24.3% more likely to buy a food processor 🧠 Why? - We judge the value of a discount by comparing it to the original price - It’s easier to calculate the difference when larger numbers appear before smaller numbers - This is known as the ‘subtraction principle’ 👀For example, we offer a special 50% discount on our Pricing & Promotions Playbook for new subscribers to the Science Says newsletter. On that special page after subscribing, you’ll notice the discounted price is displayed on the right. 📈 So place your discounted price to the right of the original price when doing promotions. ✋ Careful, this effect only works for moderate discounts. It can backfire for very low (<10%*) or very high discounts (>60%). *These are approximate figures. The study did not specify exact ranges. 🎓 Want more science-based practical insights? - Follow me - Hit the bell icon 🔔 - Subscribe for free to Science Says, my newsletter (link at the top of this post)

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What would work with very high discounts? Placing the discount to the left of the original price?

Seen similar effects in A/B tests 🤔 Presentation often moves conversion more than the discount size. Teams need to stop underestimating how much UI drives pricing perception

This happens because of the Subtraction Principle in Pricing. When the original price appears first, it becomes the reference point, so customers mentally subtract the new price and clearly perceive the savings. Still feel 80% will go with the first one on the left For example, Seeing $90 → $60 highlights the $30 discount, making the deal feel bigger. If the sale price appears first ($60 → $90), people focus on the final price rather than the savings, so the discount feels less compelling

Both offer the same discount, but the second grabs more attention. This is exactly what neuromarketing explains.

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