Neil Rackham is a British writer born in 1942. His works primarily focus on the fields of business and sales, with his most famous book being 'The Secret of Selling'. Rackham has conducted in-depth research in the areas of sales psychology and sales techniques, and his books have had a profound impact on the sales industry.
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Source: SPIN Selling: Situation Problem Implication Need-Payoff
“Is your sales call so valuable that your client would write a check for your visit?”