英文文献：Coupon Redemption
英文文献作者：Ward, Ronald W.,Davis, James E.
英文文献摘要：
The contention that coupons are effective, in meeting the basic user objective of increasing sales has attained widespread acceptance among marketers and merchandisers. This is evident in a recent A.C. Nielsen report (1) which shows almost 100% growth in coupon use since 1971 while the number of companies using coupons reached record high levels during the early seventies.