Ahead of IPO, Uber faces questions about business viability

When ride-sharing pioneer Uber goes public Friday, it will be the largest public stock offering in the U.S. since 2014. But the company, its business model and how it pays its drivers remain controversial. William Brangham asks Farhad Manjoo of The New York Times and The Information's Amir Efrati about why there’s so much interest in Uber’s IPO and the viability of its business model more broadly.