The guest on this week's nationally syndicated Motley Fool Money radio show is Alex Goldfayn, author of Evangelist Marking: What Apple, Amazon, and Netflix Understand About Their Customers (That Your Company Probably Doesn't). In this audio segment, he analyzes the challenges facing Best Buy and shares what the company can learn from Apple, especially when it comes to generating in-store revenue on a pace even better than diamond retailer Tiffany.