The Four P's are not the Nine P's of Marketing.
Here's the right answer:
- The Four P's of the Marketing Mix are: Product, Price, Promotion and Place.
The Marketing Mix is brilliant but the customer or "People/" potential purchasers are forgotten and should be central.
- The Nine P's of Marketing (c) 2007 by Larry Steven Londre are Planning, Product, Price, Place, Promotion, People, Passion, Partners and Presentation. A paper on the Nine P's of Marketing can be found at http://nineps.com. Also at http://londremarketing.com under articles and resources.