Mark Miller of William Blair gives a bump to his rating of Amazon.com (AMZN +3.3%), to...

|By:, SA News Editor

Mark Miller of William Blair gives a bump to his rating of Amazon.com (AMZN +3.3%), to Outperform - and downgrades Target (TGT) and Wal-Mart (WMT) to "Market Perform" - after comparing the websites and finding AMZN can keep up even with low-price performers because it carries so many more products than even Target.com and Walmart.com.