Titans: What do you think is going to sneak up on the market that no-one sees? Cook: Some grassroots, millennial driven app or platform that acts like a referral system that dominates and guides Gen Z’s spending and cultural attitudes.   Titans: What is the most important rule in your life? Cook: Trying to do the right thing. Life and business are marathons, and eschewing the short term fix for what’s right longer term is challenging. Barack’s “When they go low, we…