Sandwiching is a business model where a company acquires two opposing audiences and combines them into a single marketplace, acting as the facilitator between groups that were previously disconnected.

📝Tinder, 📝Uber, and 📝Airbnb are canonical examples — connecting men and women, riders and drivers, travelers and hosts. The model differs from a simple two-sided marketplace in emphasis: the business doesn't just list both sides, it actively curates and balances the match between them, since neither side has value without the other showing up in sufficient volume and quality. Getting the ratio and incentives right on both sides simultaneously is the model's central execution risk — grow one side too far ahead of the other and the marketplace collapses into churn rather than reaching a 📝Tipping Point.