Identifying Your Best Customers,
by Nat G Bodian

The best prospects on any consumer list are those who make frequent purchases in significant amounts. Identifiable by computer search, they fit into the RFM formula: Recency of purchase, Frequency of purchase, and Monetary value of purchase. The RFM formula works best when mail-order catalog houses assign points in each of the three RFM categories. To avoid waste circulation, points are assigned in each category and catalogs are then mailed only to those who get the most points and are deemed the most likely to buy again. 

(Taken from "Direct Marketing Rules of Thumb)

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