Pitney Bowes Inc) i "Not everything that counts can be counted, and not everything that can be counted, counts".-Attributed to Albert Einstein i The paper expresses views and ideas of the authors that are not necessarily those of their employers CPC and Pitney Bowes Inc. The authors are grateful to Ted Kwiatkowski (CPC) for many useful comments and suggestions. ii In fact the distinction between mail item and mail product is frequently so convoluted that it is hard to say what is what. We believe that we have provided a conceptually clear distinction (Pintsov and Obrea, 2008) where we have stated that a mail item had specific values of its intrinsic measurable attributes (dimension, weight etc.) while postal product description contained acceptable ranges for all explicitly specified attributes of mail items.

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