You know your business model is broken when you're suing your customers.

What I tell founders is not to sweat the business model too much at first. The most important task at first is to build something people want. If you don't do that, it won't matter how clever your business model is.

Napster was predicating its business model on violation of copyright.

Eviction is part of a business model at the bottom of the market.

Information technology is at the core of how you do your business and how your business model itself evolves.

Textbook rental is a great concept. It is just a great business model.