seminar participants at the universities of Alicante and Trento for stimulating comments. We also thank an anonymous referee for thoughtful comments and, in particular, for raising questions that led to run additional sessions that significantly improved Section 4.4. Usual disclaimers apply. The first version of this paper was written while Giovanni Ponti was visiting the Department of Economics at UCSB. He thanks the Department for providing hospitality, encouragement and funding to run some experimental sessions. Financial support was also provided by CICYT (BEC2001-0980) and by the Instituto Valenciano de Investigaciones Econ贸micas (IVIE).
A total of 1800 eggs was examined by four experienced inspectors who estimated the Haugh unit value of each egg by candling. The eggs were of two different ages and were presented in random order to each inspector. On subsequent breaking out of the eggs the Haugh units values were measured, together with the shell thickness and yolk colour. Relations between the inspectors' estimated Haugh unit values, the measured values, and the other factors were then examined statistically. It was found that the age of egg affected the inspectors estimates' errors (the differences between their estimates and the measured values), as, to lesser extents, did the yolk colour and the shell thickness.While consistent patterns appeared in the " errors " of each inspector, their estimates of Haugh units values had low correlations (generally about 0-5) with the measured values, and similar correlations with each other. Thus it appeared that while they were trying to evaluate quality by different criteria from the measured values, they were also to some extent inconsistent with each other in their judgements.
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