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The present paper examines the ability to evaluate prices in a familiar currency (French Francs, Portuguese Escudos or Irish Punt) and in an unfamiliar currency (Euro). Participants evaluated prices for different items either by selecting the most appropriate price from a set of alternatives (in a timed or not timed version) or by directly producing a price estimate for each item. The results followed Weber's law: the standard deviation of estimated prices was proportional to their mean. Thedoi:10.1080/02724980244000044 pmid:12188509 fatcat:zjhd673glnga7okjmsovjj3hme