ToplineAmazon is consolidating its grocery brands into a $5-and-under essentials line, betting that value staples can attract cost-conscious shoppers and finally give it traction in the notoriously low margin grocery business.Close-up of Amazon Fresh grocery delivery bag on the front porch of a home, black and white, illuminated in stark light, in the San Francisco Bay Area, San Ramon, California, February, 2018. (Photo by Smith Collection/Gado/Getty Images)Getty ImagesKey FactsAmazon debuted Amazon Grocery ...