What is Walmart's ROI?

Could you please clarify what you mean by "Walmart's ROI"? Are you referring to the Return on Investment that Walmart has made in a specific project, such as their e-commerce platform or their investments in renewable energy? Or are you asking about the overall profitability of Walmart's investments in general? Understanding the specific context will help me provide a more accurate answer. Additionally, ROI calculations can vary depending on the time frame and the specific metrics used to measure the investment's success.