Langley sells truck bed liners guaranteed to last for 20 years. after every sale, langley asks his customers for the names of several friends who might also be interested in protecting the beds of their trucks. he then calls on those people and also asks them for names. langley is using the method of prospecting.

Endless Chain Method

Explanation:

According to my research on the different prospecting methods, I can say that based on the information provided within the question Langley is using the Endless Chain Method. This is a method where a salesperson asks each person that purchases their product to provide a couple of names of people that may be interested in buying that same product. Salespeople use this technique to find likely customers and therefore increase sales.

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the answer is:

c. economic output

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