In Direct Marketing, marketers send different marketing pieces in the mail…or post ads in print media…or post online on websites…or send emails.  And sales will immediately show the success or failure of the ad.  In direct mail campaigns, number of sales per number of items sent is an important number to track.…

If you look up Unique Selling Proposition in Wikipedia, you see this definition:

In Reality in Advertising Reeves laments that the USP is widely misunderstood and defines it in three parts, summarized here:

1. Each advertisement must make a proposition to the consumer—not just words, product puffery, or show-window advertising. Each advertisement must say to each reader: “Buy this…