Senior executives know that, beyond mergers and acquisitions, a company’s growth is driven one deal at a time by the way salespeople sell and negotiate. That’s why American companies spend $7.2 billion every year(1) on sales and negotiation methodologies. But beyond proprietary (and perhaps biased) consulting reports and high level-level academic papers on change, there’s little information available on whether those investing are actually achieving a return on their investment. 

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