Did you know Walmart’s advertising business accounted for about 30% of the company’s operating profit last year? Did you even know that Walmart has an advertising business?That stunning fact, unknown to many people (including me), exemplifies the conclusion of a new McKinsey study, published today. In the report, Inspired for business growth: How five companies beat the market, researchers at the consulting firm examined how big companies grow both revenue and profits impressively over time—no easy task.The ...