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a guest Mar 7th, 2013 29 Never
  1. http://www.elprisma.com/apuntes/economia/tiposdecostos/
  2.  
  3. http://www.aulafacil.com/Anabala/Lecc-26.htm
  4.  
  5. http://www.promonegocios.net/mercado/competencia-perfecta.html
  6.  
  7. http://www.slideshare.net/bsrt90/competencia-perfecta-7162145
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