These days the most fundamental strategic questions for CEOs and senior executives aren't about technology or e-commerce or talent or stock price. They're about customers. As in, do you know where your customers are? Do you know what they want? Most importantly, do you even know who your customers are? These questions aren't as simple as they seem. Customers are playing by Nine New Customer Rules -- and, more than ever, they have the power to insist that you play by their rules: