WSJ (subscription required): Study Shows E-Mail Ads Are Prompting More Sales
I tried to find this study on the DMA's site but couldn't. The write-up in the WSJ is not much longer than this excerpt:
Commercial e-mail advertisements generate more than $7.1 billion in sales each year in the U.S., and now play an important part of the U.S. economy, according to a new study that will be released this week by the Direct Marketing Association.
. . .
About 36% of e-mail users, or 21% of all adult Americans, have bought a product or service as a result of some form of commercial e-mail over the last year, the study says. This group of users made an average purchase of $168.
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