In this week’s arti­cles, Wal-Mart is look­ing to use e-receipts as a new sales tool, Sears intro­duces a new ser­vice for its loy­alty mem­bers, Tar­get expands its online sub­scrip­tion pro­gram to com­pete with Ama­zon, and the demand for data-savvy pro­fes­sion­als con­tin­ues to grow.