In this segment of the Motley Fool Money podcast, host Chris Hill is joined by Million Dollar Portfolio's Jason Moser, Hidden Gems Canada's David Kretzmann, and Total Income's Ron Gross to reflect on last week's business and economic news, and one of the big stories was the annual letter to shareholders from Amazon.com (NASDAQ: AMZN) boss Jeff Bezos, which included, finally, word on how large its Amazon Prime service has become.Given that Prime is the keystone in the arch of the company's e-commerce strategy, it's information investors should take seriously.