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A cost effective marketing strategy where two or more companies represent the other firm's non-competing product in various promotions or through referrals.
At the networking mixer, Mary the wedding planner got together with Jason the videographer and mentioned to him how trying out some "piggyback marketing" could work out well for both of them.

i.e., "I'll put a link to your website on my site, if you'll put a link to my website on yours."
by ZonaCat Hansen October 28, 2010