What is the difference between the concept of marketing and the marketing concept?

The concept
of marketing is the overall idea of marketing and how to go about marketing well to customers.
It's a five step plan that is broken out as an overarching idea into the concepts of production,
selling, marketing, product, and societal marketing. These are all fundamental aspects of the
overall concept of marketing and that holistic idea is different than "the marketing
concept," which is only one facet of the overall equation.

The marketing
concept is the idea that a business should tackle the task of meeting customer needs by
producing a product that helps their lives, is useful, and/or is better and more effective than
competitors' products.

The marketing concept is generally what people think
of as "marketing" because it involves brand positioning, advertising, and similar
actions. The concept of marketing is the holistic concept that encompasses every aspect of
marketing, from product creation, to the method of sales, to the societal impact, and to
word-of-mouth advertising.