Commerce Quarterly The economics of selling online
Commerce Quarterly

Costs · Margins · The business of ecommerce

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Guide

Unit Economics 101 for a Store, With a Worked Model

Forget the spreadsheet templates with 40 tabs. Unit economics is one question: after one order pays its own bills, what is left? Here is the math on a single $60 order, every line explained.

Jul 31, 2026

Costs, margins & indexes

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, One order carries five costs before it contributes anything: product, shipping, packaging, payment processing and the marketing that produced it. On our worked $60 order, those five lines eat $48 and leave $12 of contribution.
2026 In NYU Stern's January 2026 dataset, net margins across retail-adjacent sectors cluster between 1% and 7%: general retail 5.6%, apparel 3.9%, furniture 1.1%, household and personal products 11.7%.
90 A lean 90-day launch costs about $14 in platform bills: a ~$11 domain, $1/month Shopify promo pricing for 3 months, a free theme and free email tiers.

Starting up & briefings

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Data briefing

Profit Margins by Niche: Every Published Dataset, One Table

Most 'average margin by niche' articles quote each other in a circle. We went to the three sources that actually publish numbers: NYU Stern's sector dataset, SEC annual reports, and Shopify's own rule of thumb.