<prompt> Translate the following text to EnglishHata hivyo, nadharia hii haiwezi kuthibitishwa moja kwa moja kwa sababu hatuna data ya kutosha ya gharama kwa nchi nyingine ili kulinganisha na matokeo ya mfano.  <response>: 3 The hypothesis cannot, however, be directly confirmed because we do not have sufficient cost data on other countries to compare with the model results. 