I really like the idea of sustainable models that enact positive social change, especially social enterprises.

A social enterprise operates like a business, produces goods and services for the market, but manages its operations and redirects its surpluses in pursuit of social or environmental goals. Unlike a charity, a social enterprise generates its own income, and is not reliant on donations in order to deliver a social good.

During 2015 while studying Social Enterprises, a group of fellow students founded Startup Social which helps social entrepreneurs learn the skills to start and grow their social enterprises.