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One of the limitations of the 4Ps approach is its emphasis of an inside out-view.  An inside-out approach is the traditional planning approach where the organisation identifies its desired goals and objectives, which are often based around what has always been done. Marketing's task then becomes one of "selling" the organization's products and messages to the "outside" or external stakeholders. In contrast, an outside-in approach first seeks to understand the needs and wants of the consumer.
To overcome the deficiencies of the 4P model, some authors have suggested extensions or modifications to the original model. Extensions of the four P's are often included in cases such as services marketing where unique characteristics (i.e. intangibility, perishability, heterogeneity and the inseparability of production and consumption) warrant additional consideration factors. Other extensions have been found necessary for retail marketing, industrial marketing, and internet marketing
Barney stated that for resources to hold potential as sources of sustainable competitive advantage, they should be valuable, rare and imperfectly imitable. A key insight arising from the resource-based view is that not all resources are of equal importance nor possess the potential to become a source of sustainable competitive advantage. The sustainability of any competitive advantage depends on the extent to which resources can be imitated or substituted. Barney and others point out that understanding the causal relationship between the sources of advantage and successful strategies can be very difficult in practice. Barney uses the term "causally ambiguous" which he describes as a situation when "the link between the resources controlled by the firm and the firm's sustained competitive advantage is not understood or understood only very imperfectly." Thus, a great deal of managerial effort must be invested in identifying, understanding and classifying core competencies. In addition, management must invest in organisational learning to develop and maintain key resources and competencies.
A strategic business unit (SBU) is a subsidiary within a firm, which participates within a given market/industry. The SBU would embrace the corporate strategy, and attune it to its own particular industry. For instance, an SBU may partake in the sports goods industry. It thus would ascertain how it would attain additional sales of sports goods, in order to satisfy the overall business strategy. Digital Marketing for Beginners: 7 Strategies That Work