E. Jerome McCarthy organized the marketing decision into four levers in 1960: Product, Price, Place, and Promotion. In 1981 Bernard Booms and Mary Bitner extended it to 7P for services. They added three levers that matter when the "product" is partly delivered by people in real time, in a space the customer can see. People means who serves the customer, and how they're trained. Process is the steps the service follows. Physical evidence is the tangible cues (décor, packaging, an app's interface) that signal quality before anyone can inspect the outcome.
How do you use the marketing mix as a coherence test?
The driver logic isn't "get each lever right on its own." The claim is that all seven levers must send one consistent signal about the same positioning. Why so strict? A customer experiences them all at once and reads a mismatch as a warning. They don't see seven independent decisions. Pair a premium Price with a downmarket Place and it doesn't average out to "medium". It reads as confusion or as a bait-and-switch, and it depresses conversion however well any single lever was executed. Used properly, 4P/7P is a coherence audit. Pick the customer promise you intend to make, then check whether all seven levers actually deliver it, together.
Building it correctly starts with the intended positioning, written as a single sentence like "fastest, most convenient, not the cheapest and not the most premium." Then run each lever as a yes/no test against it, with evidence. Does Price signal convenience at a fair price, or does it say "cheap" in a way that contradicts a quality claim somewhere else? Does Place actually deliver the convenience promise, or does it only look convenient on a map while real wait times undercut it? Built this way, the audit gives you a short list of the levers that are out of line with the promise. You don't end up with seven paragraphs describing seven levers that happen to coexist.
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What are the blind spots of the marketing mix?
The mix has three blind spots at the mechanism level. First, the framework is inside-out. It starts from what the firm makes, prices, places, and promotes, and the customer's actual job never comes into it. Jobs-to-be-done exists to close that gap. A business can nail all seven Ps in service of the wrong job and still fail, as Worked Example 3 shows. Second, used mechanically, it turns into a checklist that can't prioritize. It doesn't say which lever matters most for this category. Price and Place typically dominate a commodity. Product and Promotion typically dominate a status good. So "address all seven equally" is often a bland plan. Third, the extended People/Process/Physical Evidence levers can drift into operational description that never asks whether the operation differentiates the offer. You can fill all seven boxes with adjectives and still have no strategy, and the next lesson makes that warning explicit for every framework here.