?ata???ste t?? ??s?a t?? ???s?da? ???a? t?? Michael Porter se µ???? 50 ?ept? µe a?t? t? p?a?t??? ?a? s???pt??? ß?ß???. ? ???s?da ???a? t?? Michael Porter e??a? ??a s????? ?a?? te?µ????µ???? d??se?? p?? ap?s??p??? st?? eµp???a ?a? t? ße?t??s? e??? s???e???µ???? p?????t?? ? ?p??es?a?. ???a?, ep?µ????, ??a a?a??t??? e??a?e?? p?? µp??e? ?a ???s?µ?p????e? ??a ?a d?se? se ???e ep??e???s? p?? as???e?ta? µe t? d?µ??????a a??a? ??a a?ta????st??? p?e????t?µa st?? ep??e???µat??? ??sµ?. Se a?t? t? ß?ß???, ?a ??ßete µ?a e????st? e?sa???? st?? a??s?da a??a? ??a ?a t?p??et?sete s?st? t? p????? ? t?? ?p??es?a sa? st?? a????. ??? µ??? ?a µ??ete p?? ?a ???s?µ?p???sete a?t? t? µ??t??? ??a ?a ße?t??sete t?? ?p??es?e? sa?, ?a µe??sete t? ??st?? ?a? ?a d?µ??????sete a??a, a??? ?a e?et?sete ep?s?? p?a?µat???? pe??pt?se??, ?a a?a?a???ete t?? ad??aµ?e? t?? e??a?e???, s?µpe???aµßa??µ???? t?? d?s????a? efa?µ???? t??, ?a? ?a µ??ete pe??ss?te?a ??a s??af? µ??t??a, ?p?? ta p??te d???µe?? t?? Porter. 

S?et??? µe t?? a??s?da a??a? t?? Michael Porter: S?µf??a µe t?? ?????a t?? a??s?da? a??a? t?? Porter, ??e? ?? ep??e???se?? ?a p??pe? ?a µe?et?s??? t?? ?????a t?? d?µ??????a? a??a? p??? a???s??? ?a a?apt?ss??? a?ta????st??? p?e????t?µa. ? a??s?da a?t? d?e??????e? t?? ep??e???s? a?a????ta? t?? d??f??e? ?e?t?????e? µ?a? ep??e???s?? ?a? e?et????ta? t? ??st?? t???. ??t? ep?t??pe? st?? eta??e?e? ?a ?ata??µ??? ap?te?esµat??? t??? p????? ?a?, ?? e? t??t??, ?a t?p??et??? ap?te?esµat??? ta p?????ta st?? a????. Se a?t? t? ß?ß???, ?a a?a?a???ete p?? ? a??s?da a??a? t?? Michael Porter µp??e? ?a sa? ß????se?, ?a µ??ete p?? ?a µe??sete t? ??st?? sa? ?a? ?a ???s?µ?p???sete a?t? t? ???s? ??a ?a a???sete t?? pa?a??????t?ta ?a? ?a ep?t??ete ß??s?µ? a??pt???. ??a saf?? e????s? t?? p?e??e?t?µ?t?? ?a? t?? p??a??? µe???e?t?µ?t?? t?? µe??d??, µ?a s???t?s? µ?a? p?a?t???? µe??t?? pe??pt?s?? ?a? µ?a e?sa???? se s??af? µ??t??a sa? d????? ta e??a?e?a p?? ??e???este ??a ?a p??sa?µ?sete t?? p??s????s? sa? st?? pe??pt?s? sa?