The operator library
Make the next decision with better numbers.
Original worked examples, practical checklists, and tools for the decisions behind an ecommerce business. Free to read and download.
Profitability
Is this product actually profitable?
A worked unit-economics example that includes fulfillment, advertising, returns, and overhead—plus a free profitability worksheet.
6 min read · Open guide →Advertising
How much can you afford to spend on advertising?
Work out an advertising ceiling from contribution margin, then translate it into ACoS, ROAS, and a cost-per-click planning limit.
6 min read · Open guide →Multichannel operations
What changes when you add another marketplace?
A practical launch framework for channel economics, shared inventory, fulfillment, returns, and a controlled marketplace pilot.
6 min read · Open guide →Keep a working copy
Two practical downloads. No signup required.
Printable HTML files that open in your browser and work offline. Print them or use your browser’s Save as PDF option. Write your own inputs and assumptions alongside the examples.