A succession of announcements emerged from Wal-Mart this week as the world's largest retailer looked to make its sourcing more effective, drive growth in the US and launch an online strategy around a new site - Global.com. Meanwhile, retailers on both sides of the pond - Morrisons in the UK and A&P in the US - named new CEOs and the big two grocers in Australia slashed prices. These were the ten most popular stories on just-food this week.