<prompt> Translate the following text to EnglishMbinu tofauti na dhana kwa ajili ya mbinu hizi ni kujadiliwa katika sehemu ndogo tofauti katika sehemu ya madhara makadirio na tathmini hapa chini.  <response>: The different methodologies and assumptions for these approaches are discussed in separate subsections in the effects estimation and valuation sections below. 