Ordered fuzzy numbers in financial stock and accounting problems

Applicability of the fuzzy approach to problems in economics and finance is presented. One problem arrives when a comparison between mutually exclusive investment alternatives is performed using the internal rate of return (IRR). Another problem originating from administrating accounting, deals with the determination of an economic order quantity (EOQ) with imprecise and vague data. Financial stock time series are presented together with the so-called Japanese candlesticks. The model of Ordered Fuzzy Numbers, developed by the first author (W.K.) and his two co-workers is used. The present approach generalizes that developed within the model of Convex Fuzzy Numbers and stays outside the probabilistic one.