<prompt> Translate the following text to SwahiliWillingness to pay and Willingness to accept are comparable measures when the change in environmental quality is small and there are reasonably close substitutes available.  <response>: Utayari wa kulipa na utayari wa kukubali ni vipimo vinavyoweza kulinganishwa wakati mabadiliko katika ubora wa mazingira ni madogo na kuna mbadala wa karibu zinazopatikana. 