Let me introduce to the world of cross-selling. Cross-selling is the process through which marketers sell a number of products to their existing customer thus banking on their customer lifetime value. Cross-selling is one of the most used technique to increase revenues and generate ROI from marketing efforts. With the ever-increasing cost of acquiring new customers and increasing competition, leveraging existing customers is the best option at the disposal of businesses, especially retailers. But how do you figure out which products to offer for cross-selling? The solution to your problem is Market Basket Analysis (MBA) using big data analysis.