# HARD MARGINS by RetentionX > The #1 Newsletter for E-Commerce Operators: Best practices, industry benchmarks, data insights & marketing strategies in a weekly brief. This file provides information about HARD MARGINS by RetentionX to help large language models understand and reference this publication's content. ## Posts - [John Feeney on acquiring the right customers, not the most customers.](https://newsletter.retentionx.com/p/john-feeney-runs-ecommerce-for-the-largest-supplement-brand-in-the-uk-his-rule-acquire-the-right-cus): The Head of eCommerce for one of the largest supplement businesses in the UK on why deep discounts buy you the wrong buyers, auditing your assortment for customer quality and building an acquisition and retention flywheel. - [The Acquisition Treadmill Ratio](https://newsletter.retentionx.com/p/the-acquisition-treadmill-ratio): How much of your monthly revenue had to be bought again from scratch? - [The Acquisition Treadmill](https://newsletter.retentionx.com/p/the-acquisition-treadmill): How much of your monthly revenue had to be bought again from scratch? - [Matt Nastos Runs Growth for 100+ Premium Brands.](https://newsletter.retentionx.com/p/matt-nastos-runs-growth-for-100-premium-brands): On creators as the new wholesale, TikTok's AOV ceiling, and the category he's most quietly bullish on. - [Who are your VIPs, actually? ](https://newsletter.retentionx.com/p/who-are-your-vips-actually-174e): An arbitrary "VIP" definition will shape your whole retention program around a segment that describes no one. - [Who are your VIPs, actually?](https://newsletter.retentionx.com/p/who-are-your-vips-actually): RFM is simple enough for Monday’s team meeting and powerful enough to change your growth strategy. - [LTV is an Ops Metric](https://newsletter.retentionx.com/p/ltv-is-an-ops-metric-5880): Optimizing for LTV isn't just optimizing for growth. It's optimizing for operational simplicity. That's because The cost of bad acquisition is living in your support queue, your warehouse, and your team's calendar. - [6 Claude Workflows For Commerce](https://newsletter.retentionx.com/p/6-claude-workflows-for-commerce): Why connecting Claude to your store isn’t enough, and what a commerce data layer changes. - [Reducing Operational Chaos](https://newsletter.retentionx.com/p/reducing-operational-chaos): When customer quality rises, revenue goes up - and operational chaos goes down. Fewer tickets, fewer returns, fewer refunds - more time for improvements and upsell. - [The Price - CAC Spiral](https://newsletter.retentionx.com/p/the-price-cac-spiral-65df): When CAC rises, the default move is to raise prices to protect margin. Higher prices make conversion harder, which makes CAC rise again. Without stronger LTV underneath the model, the loop tightens until growth stalls. - [The Price - CAC Spiral](https://newsletter.retentionx.com/p/the-price-cac-spiral): Rising CAC pushes prices up to protect margin → conversion gets harder → CAC rises again. Without stronger LTV and a staple ‘milk’ product, the spiral tightens until growth stalls. - [Stop Optimizing for Lower CAC in Isolation](https://newsletter.retentionx.com/p/stop-optimizing-for-lower-cac-in-isolation-643c): A low CAC is not evidence of efficiency. It's evidence that you acquired someone cheaply. Whether that was a good decision depends entirely on what happened next. - [Coupons train price sensitivity](https://newsletter.retentionx.com/p/coupons-train-price-sensitivity): How to use product journey data to guide the next purchase – with relevance, not blanket promos - [Stop Optimizing for Lower CAC in Isolation](https://newsletter.retentionx.com/p/stop-optimizing-for-lower-cac-in-isolation): CAC is just what it costs to start the relationship; LTV is what you earn if you don’t screw up the relationship. - [How PlantPaper Built one of The Best Retention Curves in DTC](https://newsletter.retentionx.com/p/how-plantpaper-built-one-of-the-best-retention-curves-in-dtc): Lee Reitelman on LTV, discipline, and why high CAC is easier to fix than low LTV. - [Your 12-month LTV sets your max CAC](https://newsletter.retentionx.com/p/your-12-month-ltv-sets-your-max-cac): If you can’t answer “What is your 12-month LTV?” (based on profit, not revenue) without logging into five tools, you’re scaling an eCom brand blindfolded. - [Two Product Superpowers](https://newsletter.retentionx.com/p/two-product-superpowers): Brand stickiness and product stickiness are two different superpowers – and you should treat them as different muscles. - [LTV is a curve, not a single metric](https://newsletter.retentionx.com/p/ltv-is-a-curve): Payback and cash risk depend on when value shows up. - [How To Build Decision Frames](https://newsletter.retentionx.com/p/how-to-build-decision-frames): The filter you give customers impacts everything downstream. - [Ways to Increase LTV](https://newsletter.retentionx.com/p/ways-to-increase-ltv): Enough theory! Let's get hands-on and start optimizing your metrics for success. - [Your Ad Platforms Aren't Broken. They're Learning From The Wrong Signals. ](https://newsletter.retentionx.com/p/your-ad-platforms-aren-t-broken-they-re-learning-from-the-wrong-signals): Plus: Introducing Hard Margins. Same newsletter. New name. And we just launched a podcast. - [The SKU Graduation Board](https://newsletter.retentionx.com/p/the-sku-graduation-board): Most brands promote everything too early. This team built a system to stop that. - [One customer. Five identities.](https://newsletter.retentionx.com/p/one-customer-five-identities-00d6): You can't make good decisions about customers you can't identify. - [ROAS Went Up. Payback Got Worse.](https://newsletter.retentionx.com/p/roas-went-up-payback-got-worse): That’s not performance. That’s debt with good branding. - [You're Not Managing Returns. You're Managing an Average.](https://newsletter.retentionx.com/p/you-re-not-managing-returns-you-re-managing-an-average): The customers destroying your contribution margin aren't hard to find. You're probably emailing them a promo right now.