As a society, we fine-tuned our understanding of the firm as a function, and we got stuck. In 1973, Drucker revealed the essence of this black box with inputs and outputs: "the purpose of business is to create and keep a customer." In 1985, Porter took us deeper with the value chain. Then, in the late 1990's, we fluffed up that concept and developed the business model. Still there today.
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