Leila Janah, whose social enterprise Samasource has allowed 45,000 people in sub-Saharan Africa and other parts of the world move out of poverty through fair-wage digital work, implores aspiring entrepreneurs to launch startups that have an impact beyond making “an incremental change in the lives of rich people.” In the long run, the most valuable companies will be those that make the biggest social and environmental contributions, Janah says.