residual earnings
A type of affiliate program where an affiliate is paid for not only the first sale from a referral, but and all subsequent sales from that referrer over the life of the customer.
See "How Affiliate Marketing Works" in the Did You Know... section of Webopedia.
Also see Refer-It.com, a directory of referral & affiliate programs for e-commerce, featuring information on over 6,500 affiliate programs.


