There is a difference between one customer buying 15 products and 15 customers buying one product. The Unique Purchase metric helps you discover that difference.

In this new episode of Data Snacks, we will help you get to know your customers’ purchase habits by tracking and visualizing Google Analytics data. 
We’ll show you how to: 
Determine which metrics you should track to identify your customers’ purchase habits 
How to assess the popularity and revenue potential of your products
How to use this data to adjust your strategy to increase sales
This information can help you decide which topics and keywords to focus on for content marketing. It can also help you evaluate the effectiveness of your sales and marketing efforts to drive new sales.

Read more about it here: https://databox.com/data-snack-how-to-identify-your-customers-purchase-habits-using-google-analytics