Agrowth strategy that employs the existing marketing mix and focuses the firm's efforts on existing customers.

Market Penetration Strategy

Explanation:

According to my research on different market strategies, I can say that based on the information provided within the question the term being described is called a Market Penetration Strategy. Like mentioned in the question, this strategy focuses on using your existing product line (usually products that have not yet hit the store shelves) within the same existing market. This is done in order to obtain higher market shares and obtaining an increased amount of sales from other market participants.

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