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By asking other people what their experiences were with a product and by asking them for their recommendations, we can access a vast amount of experience without having to spend time, money, or effort—or take the risks that we would by doing it on our own. So, we not only ask what product is best, but we ask, “What was your experience?” What should we watch out for and what tricks and tips should we follow? How can we best try it, fix it, and teach others to use it? Who has the best prices and delivery? Who is honest? All of this saves a tremendous amount of time. We could never function in the modern world without sharing experiences through word of mouth.
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George Silverman (The Secrets of Word-of-Mouth Marketing: How to Trigger Exponential Sales Through Runaway Word of Mouth)