<prompt> Translate the following text to EnglishBaada ya kuchunguza matokeo ya mafanikio cream skimming juu ya viwango vya huduma ya posta, sisi kueleza kwa nini cream skimming ni uwezekano wa kuwa na mafanikio juu ya njia za biashara katika Marekani.  <response>: After examining the consequences of successful cream skimming on Postal Service rates, we explain why cream skimming is not likely to be successful on business routes in the U.S. 