<prompt> Translate the following text to EnglishBila uchunguzi wa umma na ukaguzi wa masharti ya kiwango fulani au mkataba wa huduma kati ya Huduma ya Posta na mteja, hakutakuwa na uhakika kwamba vigezo hivi vya msingi vitatimizwa.  <response>: Without public scrutiny and review of the terms of a given rate or service agreement between the Postal Service and a customer, there could be no assurance that these substantive criteria would be satisfied. 