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\u03b5\u03c0\u03b9\u03ba\u03c1\u03ac\u03c4\u03b7\u03c3\u03b7 \u03c4\u03b7\u03c2 \u03b2\u03b9\u03bf\u03bc\u03b7\u03c7\u03b1\u03bd\u03af\u03b1\u03c2. \u03a4\u03c5\u03c0\u03b9\u03ba\u03ac \u03c5\u03c0\u03ac\u03c1\u03c7\u03bf\u03c5\u03bd \u03c4\u03ad\u03c3\u03c3\u03b5\u03c1\u03b9\u03c2 \u03c4\u03cd\u03c0\u03bf\u03b9 \u03c3\u03c4\u03c1\u03b1\u03c4\u03b7\u03b3\u03b9\u03ba\u03ce\u03bd \u03c0\u03bf\u03c5 \u03b5\u03c0\u03b9\u03ba\u03c1\u03b1\u03c4\u03bf\u03cd\u03bd \u03c3\u03c4\u03b7\u03bd \u03b1\u03b3\u03bf\u03c1\u03ac:<\/p>\n<p>\u0394\u03b9\u03b5\u03c5\u03b8\u03c5\u03bd\u03c4\u03ae\u03c2<br \/>\n\u03a0\u03c1\u03bf\u03ba\u03b1\u03bb\u03ce\u03bd<br \/>\n\u0391\u03ba\u03cc\u03bb\u03bf\u03c5\u03b8\u03bf\u03c2<br \/>\n\u0391\u03c5\u03c4\u03cc\u03c2 \u03c0\u03bf\u03c5 \u03c0\u03b1\u03af\u03c1\u03bd\u03b5\u03b9 \u03b8\u03ad\u03c3\u03b7<\/p>\n<p><strong>\u039f\u03b9 \u03b3\u03b5\u03bd\u03b9\u03ba\u03ad\u03c2 \u03c3\u03c4\u03c1\u03b1\u03c4\u03b7\u03b3\u03b9\u03ba\u03ad\u03c2 \u03c4\u03bf\u03c5 Porter.<\/strong> \u03a3\u03c4\u03c1\u03b1\u03c4\u03b7\u03b3\u03b9\u03ba\u03ae \u03c3\u03c4\u03b9\u03c2 \u03b4\u03b9\u03b1\u03c3\u03c4\u03ac\u03c3\u03b5\u03b9\u03c2 \u03c4\u03bf\u03c5 \u03c3\u03c4\u03c1\u03b1\u03c4\u03b7\u03b3\u03b9\u03ba\u03bf\u03cd \u03c3\u03ba\u03bf\u03c0\u03bf\u03cd \u03ba\u03b1\u03b9 \u03c4\u03b7\u03c2 \u03c3\u03c4\u03c1\u03b1\u03c4\u03b7\u03b3\u03b9\u03ba\u03ae\u03c2 \u03b9\u03c3\u03c7\u03cd\u03c2. \u039f \u03c3\u03c4\u03c1\u03b1\u03c4\u03b7\u03b3\u03b9\u03ba\u03cc\u03c2 \u03c3\u03ba\u03bf\u03c0\u03cc\u03c2 \u03b1\u03bd\u03b1\u03c6\u03ad\u03c1\u03b5\u03c4\u03b1\u03b9 \u03c3\u03c4\u03b7 \u03b4\u03b9\u03b5\u03af\u03c3\u03b4\u03c5\u03c3\u03b7 \u03c4\u03b7\u03c2 \u03b1\u03b3\u03bf\u03c1\u03ac\u03c2, \u03b5\u03bd\u03ce \u03b7 \u03c3\u03c4\u03c1\u03b1\u03c4\u03b7\u03b3\u03b9\u03ba\u03ae \u03b9\u03c3\u03c7\u03cd\u03c2 \u03c3\u03c4\u03bf \u03c0\u03b1\u03c1\u03b1\u03c4\u03b5\u03c4\u03b1\u03bc\u03ad\u03bd\u03bf \u03b1\u03bd\u03c4\u03b1\u03b3\u03c9\u03bd\u03b9\u03c3\u03c4\u03b9\u03ba\u03cc \u03c0\u03bb\u03b5\u03bf\u03bd\u03ad\u03ba\u03c4\u03b7\u03bc\u03b1 \u03c4\u03b7\u03c2 \u03b5\u03c4\u03b1\u03b9\u03c1\u03b5\u03af\u03b1\u03c2. \u03a4\u03bf \u03b3\u03b5\u03bd\u03b9\u03ba\u03cc \u03c0\u03bb\u03b1\u03af\u03c3\u03b9\u03bf \u03c3\u03c4\u03c1\u03b1\u03c4\u03b7\u03b3\u03b9\u03ba\u03ae\u03c2 (Porter 1984), \u03c0\u03b5\u03c1\u03b9\u03bb\u03b1\u03bc\u03b2\u03ac\u03bd\u03b5\u03b9 2 \u03b5\u03bd\u03b1\u03bb\u03bb\u03b1\u03ba\u03c4\u03b9\u03ba\u03ad\u03c2 \u03bc\u03b5 2 \u03b5\u03bd\u03b1\u03bb\u03bb\u03b1\u03ba\u03c4\u03b9\u03ba\u03bf\u03cd\u03c2 \u03c3\u03ba\u03bf\u03c0\u03bf\u03cd\u03c2. \u0391\u03c5\u03c4\u03ad\u03c2 \u03b5\u03af\u03bd\u03b1\u03b9 \u03b4\u03b9\u03b1\u03ba\u03c1\u03af\u03c3\u03b5\u03b9\u03c2 \u03ba\u03b1\u03b9 \u03c7\u03b1\u03bc\u03b7\u03bb\u03bf\u03cd \u03ba\u03cc\u03c3\u03c4\u03bf\u03c5\u03c2 \u03c3\u03c7\u03ad\u03c3\u03b7\u03c2 \u03c4\u03bf \u03ba\u03b1\u03b8\u03ad\u03bd\u03b1 \u03bc\u03b5 \u03bc\u03b9\u03b1 \u03b4\u03b9\u03ac\u03c3\u03c4\u03b1\u03c3\u03b7 \u03b1\u03c0\u03cc \u03c0\u03bb\u03ae\u03c1\u03b7 \u03ae \u03c0\u03b5\u03c1\u03b9\u03bf\u03c1\u03b9\u03c3\u03bc\u03ad\u03bd\u03b7 \u03b5\u03c3\u03c4\u03af\u03b1\u03c3\u03b7:<\/p>\n<p>\u0394\u03b9\u03ac\u03c3\u03c4\u03b1\u03c3\u03b7 \u03c0\u03c1\u03bf\u03ca\u03cc\u03bd\u03c4\u03bf\u03c2 (\u03c0\u03bb\u03ae\u03c1\u03b7 \u03b5\u03c3\u03c4\u03af\u03b1\u03c3\u03b7)<br \/>\n\u039a\u03cc\u03c3\u03c4\u03bf\u03c2 \u03b7\u03b3\u03b5\u03c3\u03af\u03b1\u03c2 (\u03c0\u03bb\u03ae\u03c1\u03b7 \u03b5\u03c3\u03c4\u03af\u03b1\u03c3\u03b7)<br \/>\n\u039c\u03ad\u03c1\u03b9\u03c3\u03bc\u03b1 \u03b1\u03b3\u03bf\u03c1\u03ac\u03c2 (\u03c0\u03b5\u03c1\u03b9\u03bf\u03c1\u03b9\u03c3\u03bc\u03ad\u03bd\u03b7 \u03b5\u03c3\u03c4\u03af\u03b1\u03c3\u03b7)<\/p>\n<p><strong>\u039a\u03b1\u03b9\u03bd\u03bf\u03c4\u03bf\u03bc\u03af\u03b1 \u03c3\u03c4\u03c1\u03b1\u03c4\u03b7\u03b3\u03b9\u03ba\u03ce\u03bd.<\/strong> \u0391\u03c5\u03c4\u03cc \u03c3\u03c5\u03bc\u03c6\u03c9\u03bd\u03b5\u03af \u03bc\u03b5 \u03c4\u03b7\u03bd \u03b1\u03c0\u03bf\u03c4\u03af\u03bc\u03b7\u03c3\u03b7 \u03c4\u03b7\u03c2 \u03b5\u03c4\u03b1\u03b9\u03c1\u03b5\u03af\u03b1\u03c2 \u03b1\u03c0\u03cc \u03c4\u03b7\u03bd \u03b1\u03be\u03b9\u03bf\u03c0\u03bf\u03af\u03b7\u03c3\u03b7 \u03c4\u03bf\u03c5 \u03bd\u03ad\u03bf\u03c5 \u03c0\u03c1\u03bf\u03ca\u03cc\u03bd\u03c4\u03bf\u03c2 \u03ba\u03b1\u03b9 \u03c4\u03b7 \u03ba\u03b1\u03b9\u03bd\u03bf\u03c4\u03bf\u03bc\u03af\u03b1 \u03b5\u03c0\u03b9\u03c7\u03b5\u03b9\u03c1\u03b7\u03c3\u03b9\u03b1\u03ba\u03ce\u03bd \u03c0\u03c1\u03bf\u03c4\u03cd\u03c0\u03c9\u03bd. \u03a1\u03c9\u03c4\u03ac\u03b5\u03b9 \u03b5\u03ac\u03bd \u03b7 \u03b5\u03c4\u03b1\u03b9\u03c1\u03af\u03b1 \u03b2\u03c1\u03af\u03c3\u03ba\u03b5\u03c4\u03b1\u03b9 \u03c3\u03c4\u03b7 \u03ba\u03bf\u03c6\u03c4\u03b5\u03c1\u03ae \u03ba\u03cc\u03c8\u03b7 \u03c4\u03b7\u03c2 \u03c4\u03b5\u03c7\u03bd\u03bf\u03bb\u03bf\u03b3\u03af\u03b1\u03c2 \u03ba\u03b1\u03b9 \u03c4\u03b7\u03c2 \u03b5\u03c0\u03b9\u03c7\u03b5\u03b9\u03c1\u03b7\u03c3\u03b9\u03b1\u03ba\u03ae\u03c2 \u03ba\u03b1\u03b9\u03bd\u03bf\u03c4\u03bf\u03bc\u03af\u03b1\u03c2. \u03a5\u03c0\u03ac\u03c1\u03c7\u03bf\u03c5\u03bd 3 \u03c4\u03cd\u03c0\u03bf\u03b9:<\/p>\n<p>\u03a0\u03c1\u03c9\u03c4\u03bf\u03c0\u03cc\u03c1\u03bf\u03b9<br \/>\n\u039a\u03bb\u03b5\u03b9\u03c3\u03c4\u03bf\u03af \u03b1\u03ba\u03cc\u03bb\u03bf\u03c5\u03b8\u03bf\u03b9<br \/>\n\u03a0\u03c1\u03ce\u03b7\u03bd \u03b1\u03ba\u03cc\u03bb\u03bf\u03c5\u03b8\u03bf\u03b9<\/p>\n<p><strong>\u0391\u03bd\u03ac\u03c0\u03c4\u03c5\u03be\u03b7 \u03c3\u03c4\u03c1\u03b1\u03c4\u03b7\u03b3\u03b9\u03ba\u03ce\u03bd.<\/strong> \u03a3&#8217; \u03b1\u03c5\u03c4\u03cc \u03c4\u03bf \u03c0\u03bb\u03ac\u03bd\u03bf \u03c1\u03c9\u03c4\u03ac\u03bc\u03b5 \u03c4\u03b7\u03bd \u03b5\u03c1\u03ce\u03c4\u03b7\u03c3\u03b7: &#8220;\u03a0\u03cc\u03c3\u03bf \u03b8\u03b1 \u03bc\u03c0\u03bf\u03c1\u03bf\u03cd\u03c3\u03b5 \u03b7 \u03b5\u03c4\u03b1\u03b9\u03c1\u03b5\u03af\u03b1 \u03bd\u03b1 \u03b1\u03bd\u03b1\u03c0\u03c4\u03c5\u03c7\u03b8\u03b5\u03af;&#8221;. \u03a5\u03c0\u03ac\u03c1\u03c7\u03b5\u03b9 \u03ad\u03bd\u03b1\u03c2 \u03b1\u03c1\u03b9\u03b8\u03bc\u03cc\u03c2 \u03b1\u03c0\u03cc \u03b4\u03b9\u03b1\u03c6\u03bf\u03c1\u03b5\u03c4\u03b9\u03ba\u03ad\u03c2 \u03ba\u03b1\u03c4\u03b5\u03c5\u03b8\u03cd\u03bd\u03c3\u03b5\u03b9\u03c2 \u03b1\u03c0\u03b1\u03bd\u03c4\u03ce\u03bd\u03c4\u03b1\u03c2 \u03b1\u03c5\u03c4\u03ae \u03c4\u03b7\u03bd \u03b5\u03c1\u03ce\u03c4\u03b7\u03c3\u03b7, \u03b1\u03bb\u03bb\u03ac \u03bf\u03b9 \u03c0\u03b9\u03bf \u03c3\u03c5\u03bd\u03b7\u03b8\u03b9\u03c3\u03bc\u03ad\u03bd\u03b5\u03c2 \u03b4\u03af\u03bd\u03bf\u03bd\u03c4\u03b1\u03b9 \u03c3\u03b5 4 \u03b1\u03c0\u03b1\u03bd\u03c4\u03ae\u03c3\u03b5\u03b9\u03c2:<\/p>\n<p>\u039f\u03c1\u03b9\u03b6\u03cc\u03bd\u03c4\u03b9\u03b1 \u03bf\u03bb\u03bf\u03ba\u03bb\u03ae\u03c1\u03c9\u03c3\u03b7<br \/>\n\u039a\u03ac\u03b8\u03b5\u03c4\u03b7 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