unit economics

Contribution Margin: Definition & How to Calculate It

Investopedia's plain-English explainer on contribution margin — sales revenue minus variable costs — with worked examples and how to use it for pricing and product decisions.

From the site: Discover how to calculate contribution margin, a key profitability metric, by subtracting variable costs from sales revenue.

Why I recommend it: If you sell anything, know this number before you set a price. It tells you what each sale actually contributes after variable costs.

Entrepreneur White Paper: AI Tools, Prompts & Strategies for Founders

Jacqueline Tangorra's Entrepreneur white paper with 30 startup ideas, a 12-tool AI stack, four business prompts, and 12 deep strategy prompts for market sizing, competitor analysis, pricing, go-to-market, unit economics, and expansion.

Why I recommend it: The prompt library alone is worth the download. Paste the TAM, pricing, and unit-economics prompts into your AI assistant and you have a consultant-grade first draft.