How is Mitt Romney's business experience relevant?

It's been well established that Mitt Romney is a liar and a serial flip-flopper. But his big claim to fame in terms of why he should be president is that he has experience as a leader in the private sector.

Let's let PespsiCO Chairman & CEO Indra Nooyi disabuse him of the idea that this experience has any relevance to the job whatsoever.