In The Competitive Advantage of Nations, published in 1990, Porter advanced the now famous "Porter's Diamond," a four-sided framework in which the vague concept of competitive advantage is turned into something clear and concrete. From organizations as small as a single company to those as large as a nation, the basic forces at work in shaping competitive advantage are herein clearly exposed.
在一九九○年出版的《國家競爭優勢》一書中，波特提出著名的「鑽石體系」架構，使競爭力從模糊的抽象概念變得具體清晰，小至企業、大至國家，建構競爭力的大方向得以清楚浮現。