This week, Shawn Busse talks about his belief that, for all kinds of understandable reasons, business owners have been fixated on marketing tactics that amount to a losing battle of digital trench warfare. Over time, he says, those tactics have come to cost more and return less. But there are alternatives, and Shawn takes us through some examples. Plus: Are there lessons for smaller businesses in Walmart’s decision to place a big bet on a premium line of food.