For many companies, a significant amount of marketing spend is dedicated to new customer acquisition, and for good reason: most businesses wouldn’t be able to sustain themselves and grow without new customers.

But what about existing customers? How valuable are they, and what type of ROI can marketers realize by tapping their existing customer bases?

An Adobe Digital Index report explored this subject in the context of online marketing and some of the results highlighted in the infographic below demonstrate why marketers shouldn’t ignore the customers they already have.