Co-op mailing

Co-op Mailings: This category, by definition, presents a group of non-competitive advertisers mailing to a common market.

Co-op Mailing " Mailing with offers from multiple businesses.
CPI (Cost Per Inquiry) " The cost of your campaign divided by the number of inquiries you receive. This tells you how much you have spent to acquire one inquiry or potential buyer.

See also: List, Insert, Bonus, Statement stuffer, Offer