I heard a phrase the other day that resonated with things I've been thinking about and talking about on the stump recently, but I had never heard it so succinctly. I was taking a briefing from Zuora, a company involved in providing on-demand billing solutions for companies that deliver on-demand services. The phrase is "business model innovation," and it means what you think it does, but that's particularly hard to do. On the stump, I've been talking about how we've transitioned within the economy from innovating at the category level to innovating within the category.