Presented by:Michael F.Spates U.S.P.S.The United States Postal Ser-vice has four classes of mail,with some subclasses and specialservices.Each class fulfills abasic function based on customerneeds,and the service commit-ments vary from class to class.First-Class MailFirst-class mail consists ofletters,post cards and someother shapes up to 12ounces.We consider First-ClassMail to be our most importantcommodity in relation to theother three classes because it is