However, as you create new expanded text ads and add more detail to your offers within the body of your ads, you’ll likely make many of your old ad extensions redundant. Google won’t serve your ad extensions if they only serve to repeat the text already included in your ads, so make sure as you update your ads you refresh your ad extensions with new, unique content to promote alongside your new, larger ads.
Ginny Marvin is Third Door Media's Editor-in-Chief, managing day-to-day editorial operations across all of our publications. Ginny writes about paid online marketing topics including paid search, paid social, display and retargeting for Search Engine Land, Marketing Land and MarTech Today. With more than 15 years of marketing experience, she has held both in-house and agency management positions. She can be found on Twitter as @ginnymarvin.

This example illustrates why marketing metrics such as web traffic cannot be viewed in a vacuum. Two contrasting websites achieve the same outcome, where they are failing to capitalize on what they do well. By focusing on the one metric where they excel, it fails to acknowledge the area for improvement. By studying the whole picture and optimizing areas of subpar performance, ecommerce stores give their customers the best possible experience while maximizing revenue.
How much does it cost to bring in a visitor? Some web traffic is free, but many online stores rely on paid traffic — such as PPC or affiliates — to support and grow their business. Cost of Acquiring Customers (CAC) and Cost Per Acquisition (CPA) are arguably the two most important ecommerce metrics. When balanced with AOV (average order value) and CLV (customer lifetime value), a business can assess and adjust its ad spend as necessary.
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