This week’s arti­cles from our retail experts include a report on why show­room­ing might not have the impact orig­i­nally thought, a dis­cus­sion of why retail­ers should be retar­get­ing mobile con­sumers on Face­book, and a pre­dic­tion from Gold­man Sachs sug­gest­ing the slow decline of big box retail­ers like Wal-Mart and Target.