Hello and welcome to Interface Economics. Most design newsletters talk about tools and aesthetics, but this one is about revenue and conversion. My name is Hailey, and I am a Senior UX Designer interested in connecting design to real business outcomes. After all, there’s a reason we’re pushing pixels.
Every week, I will share a few relevant links and break down:
A metric to watch
A case study
What it means for your ROI
All in 5 minutes or less.
🎯 The Metric
Checkout Abandonment Rate
People are tired of creating accounts for every single app and website. Giving up personal information can be worrisome in a world where security is an increasingly serious concern. No one wants to be a victim of the next massive data breach. Especially not over buying a new pair of shoes.
The Hard Data (Convertcart 2025)
24% of online shoppers will abandon the checkout process entirely if forced to create an account. Although you can nudge them into creating accounts with special discounts for registered users, requiring an account in the checkout flow is a barrier to almost a quarter of your potential customers.
The Revenue Impact
Let’s keep the math simple and assume you have 100,000 orders with an average order value of $10. Requiring an account in the checkout flow could mean missing out on 24,000 potential orders worth a total of $240,000.
💼 The Case Study
Testing a Guest Checkout Option
A Dutch home goods brand recently hired e-commerce design agency BTNG to audit their Shopify checkout process in hopes of improving their 74% abandonment rate.
The Experiment
The original checkout flow required account creation upfront before entering any payment or shipping information. Analytics showed a 21% drop-off at that step. BTNG experimented with implementing guest checkout and making it the most prominent option in the flow, offering easy account creation after the user completed a purchase.
The Results
Checkout abandonment rate: Decreased by 16% within 30 days.
Checkout conversion rate: Increased by 23% within 60 days.
The Why
Lack of Friction. Removing unnecessary steps in the checkout process provides fewer opportunities for users to abandon it. Account creation is not truly necessary; e-commerce brands use it for remarketing purposes.
📈 The “Founder’s ROI” Calculator
The home goods brand broke even on their investment within just 16 days.
Additional Revenue from Conversion Rate Boost: + €27,000/mo
Annual Impact: + €324,000/year (est.)
Cost to Implement: €14,500
📚 The Reading List
Without or with Apple Pay on the product page? by Guess The Test
Loop Earplugs tests a similar checkout flow improvement by enabling Apple Pay on product pages.
Product Page UX 2026: 10 Pitfalls and Best Practices by Edward Scott (Baymard)
Consider these best practices to help prevent potential customers from abandoning your product pages.
The $300 million button that changed checkout behaviour by Aasma Khan (YourStory)
How changing a button label from “Register” to “Continue” unlocked $300 million in revenue.
👋 That’s all!
If you found this useful, forward it to someone who is interested in what design can do.
