The following video is from Monday's Investor Beat, in which host Alison Southwick and Motley Fool analysts Lyons George and Taylor Muckerman dissect the hardest-hitting investing stories of the day. (NASDAQ:AMZN) announced a new partnership with the U.S. Postal Service to provide online shoppers with Sunday delivery. In the lead story from Investor Beat, Lyons and Taylor discuss whether it's a smart move and why Amazon didn't choose UPS (NYSE:UPS) or FedEx (NYSE:FDX).