Margain Journal • Profit Margins

Profit Margins & COGS

Practical engineering for true contribution margins, payment gateway fee accounting, COGS tracking, and net cash flow.

Profit Margins & COGSSeptember 27, 2026•5 min read

The True Cost of Free Shipping: How to Model Shipping Subsidies Without Killing Margin

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

Recent Profit Margins Articles

Profit MarginsSeptember 24, 2026•4m

Contribution Margin vs. Gross Margin in E-Commerce

Why gross margin is deceiving for e-commerce brands. Learn how to calculate true contribution margin by factoring in shipping, gateway fees, and returns.

Margain Editorial Team