PrimeTime: Amazon sets record with Prime Day, expands advertising business; Whole Foods expands delivery service through Prime Now, Counterfeit brands hurt smaller vendors on Amazon, Best Buy differentiates itself with in-home advisors, Walmart plans to launch streaming service

The latest news on everything Amazon   Amazon now holds 49% of the ecommerce market, miles away from eBay’s 6.6% and Walmart’s 3.7%. The company exercised this muscle on July 16-17 for Prime Day, which saw 54% more sales in the first four…