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FWIW there are actually 7 P's in marketing: Product, Price, Promoton, Place, Packaging, Positioning & People.

However, I do agree with you that people often consider promotion = marketing when promotion ≠ marketing; its just one aspect of it and embracing all aspects of the marketing mix is beneficial to any company.

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The 4 and 7 has been an ongoing debate among marketing academics, it seems. I recall the "right" answer alternating course by course through school, pending the professors interest.

If I recall, the 4 P's are the standard marketing mix, with the 7 P's being called the extended marketing mix. FWIW, the 4 was definitely more central at my school.

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