Fans of Argentina take a selfie while attending the FIFA World Cup match Argentina vs Switzerland at the Fan Fest in Rio de Janeiro, on July 1, 2014. - 

Economist Chris Low discusses interest rates with Marketplace Morning Report host David Brancaccio.

Big brands are adding social media to their advertising budgets, often placing ads directly with individuals who've built large followings on sites like Instagram, YouTube, and Vine. But how do companies and these influencers hook up

Follow David Brancaccio at @DavidBrancaccio