Characteristics used to define smaller groups within a list (essentially, lists within a list). Although very small, select groups may be very desirable and may substantially improve response; increased costs, however, often render them impractical.
The Six Vital Variables of Performance Marketing: Testing Markets, Products, Prices, Offers, Media/Materials, Creative Approaches.
There are basically six major factors which affect the viability of any performance marketing operation, and it is important that you accept from the outset that each of them is variable, and you must test …