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Kenneth Fisher has made significant contributions to the world of finance. In the early 1980s, he pioneered the use of the Price to Sales Ratio. In the mid 1980s, his firm contributed to the delineation of the small cap value equity asset class and explained its relevance to investors. A decade later, his firm contributed to the recognition of distinct investment styles and cycles and conducted proprietary research aimed at identifying the drivers of these cycles. More recently, he has made significant forays into the emerging field of behavioral finance by researching its practical application in the portfolio management process. Throughout, his research has been published in numerous financial journals, including: