German translation: MAP (Mindestpreis, mit dem geworben werden darf)
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Thanks to everybody, but I think this is what I was looking for. I had not found these two pages with google for whatever reason. Part of the problem may have been my 'advertised' instead of 'advertising' which was what the client quoted me as the meaning of the accronym. I believe he made a mistake, though, and I will use the standard version and the suggested explanation. Thank you so much for your help :) 4 KudoZ points were awarded for this answer