Online retailer Amazon has announced the launch of its new 50+ Active and Healthy Living Store, which features hundreds of thousands of nutrition, wellness, exercise and fitness, medical, personal care, beauty, entertainment items and more — all in a single destination for customers in the 50+ age range.

Google is dogfooding a service called Google Shopping Express, which would offer same-day delivery from brick-and-mortar stores in the San Francisco Bay Area to the Internet giant's employees. Target and several other retailers have been named as possible partners.

With Google now looking to compete with Amazon — not to mention Target's growing attention to online and mobile commerce — a growing body of consumer studies and industry trends shows that the most important emerging consumer demographic isn't men, women, old people or young people — but multichannel consumers.

Online giant Amazon.com will begin collecting a 6% state sales tax on purchases being shipped to Pennsylvania beginning Sept. 1, according to published reports.