<prompt> Translate the following text to EnglishKwa upande mwingine, kuna hoja kwamba punguzo la ushiriki wa kazi zinahitajika kutuma ishara kwa wajumbe ambao huruhusu wajumbe kuamua kama wao au mawakala wao wanaweza kufanya kazi kwa chini ya huduma ya posta.  <response>: Third, there are arguments that worksharing discounts are needed to send signals to mailers that allow the mailers to decide whether they or their agents can do the work for less than the postal service. 