<prompt> Translate the following text to EnglishMipaka muhimu ya mfano huu ni kwamba haionyeshi mabadiliko ya muda katika mahitaji ya umeme, bei, teknolojia, au mambo mengine yanayochukuliwa ndani ya IPM.  <response>: An important limitation of this model is that it does not simulate changes over time in the demand for electricity, prices, technology, or other factors considered within IPM. 