<prompt> Translate the following text to EnglishHali ya kupunguzwa ya aina ya 4 ni ambapo mtumaji hupunguza kazi inayohitajika kwa kubadilisha tabia yake kwa njia bora ambazo hazikuwa zimetabiriwa au ambazo hazionekani kuhusishwa haswa na asili ya kupunguzwa.  <response>: A type-4 discount situation is where the mailer reduces the work required by changing his behavior in efficient ways that were either not predicted or that do not seem particularly associated with the nature of the discount. 