The gig economy offers the ultimate flexibility to set your own hours. That's why economists thought it would help eliminate the gender pay gap. A new study, using data from over a million Uber drivers, finds the story isn't so simple.

Indra Nooyi became C.E.O. of PepsiCo just in time for a global financial meltdown. She also had a portfolio full of junk food just as the world decided that junk food is borderline toxic. Here's the story of how she overhauled that portfolio, stared down activist investors, and learned to "leave the crown in the garage." (Part 3 of a special series, "The Secret Life of C.E.O.'s")