Why is return on investment (ROI) crucial to the assessment of marketing efforts?

What will be an ideal response?

ROI allows marketers to quantify the effectiveness of their marketing techniques. Measurement becomes imperative in today's global environment in which organizations are experiencing increasing price competitors and pressure from investors to perform profitably. ROI provides organizations with the ability to identify and evaluate how particular components of the marketing mix may be affecting consumer behavior. Monitoring media can tell a marketer which medium or connector is most effective at spreading a message.