Margain Journal
Rigorous analysis, attribution frameworks, and unit economics playbooks for modern e-commerce merchants.
Free shipping drives conversions, but unmodeled subsidies silently destroy profitability. Learn how to calculate net shipping drag and set a profitable free shipping threshold.
Margain Editorial Team
Commerce Intelligence
Comparing e-commerce platforms is a unit economics decision. Analyze total cost of ownership (TCO), transaction fees, developer overhead, and profit impact.
Tactical ROAS works for testing, but breaks at scale. Learn why high-growth e-commerce brands shift their primary acquisition KPI to Blended MER as ad spend grows.
Stop the confusion between daily store cash flow and monthly accountant P&Ls. Learn how cash, accrual, and contribution margin reconcile e-commerce profits.
80% of your profit comes from 20% of your products. Learn how to use SKU-level contribution margin analysis to identify unprofitable products and prune your catalog.
Learn how to calculate CAC payback period in e-commerce, why high LTV brands still run out of cash, and how to model order cycles against working capital.
Why gross margin is deceiving for e-commerce brands. Learn how to calculate true contribution margin by factoring in shipping, gateway fees, and returns.
Learn how to calculate true contribution LTV in e-commerce, avoid the dangerous gross revenue trap, and establish disciplined customer acquisition CAC ceilings.
Master the reorder point formula for e-commerce, calculate safety stock buffers, and learn how to manage supplier cash flow milestones without running out of inventory.
Understand the difference between platform-attributed ROAS and Marketing Efficiency Ratio (MER), and how the two metrics provide different views of e-commerce marketing performance.
When does it mathematically make sense to upgrade your Shopify plan? Calculate the exact revenue thresholds where higher subscription fees pay for themselves.
Compare Shopify profit tracking apps and attribution platforms. Discover how to calculate true net contribution, eliminate $300-$1,500/mo software bloat, and reconcile ad spend.
Why ad platform ROAS differs from bank deposits. Learn how attribution windows, gateway fees, COGS, and refunds impact actual marketing return.
