<prompt> Translate the following text to EnglishUchaguzi wa sera katika utafiti wa CEF ulianza na tathmini ya sekta kwa sekta ya kushindwa kwa soko na vizuizi vya taasisi kwa kupenya soko la teknolojia safi ya nishati nchini Marekani.  <response>: The selection of policies in the CEF study began with a sector-by-sector assessment of market failures and institutional barriers to the market penetration of clean energy technologies in the US. 