Default Logic in a Coherent Setting

In this talk - based on the results of a forthcoming paper (Coletti, Scozzafava and Vantaggi 2002), presented also by one of us at the Conference on "Non Classical Logic, Approximate Reasoning and Soft-Computing" (Anacapri, Italy, 2001) - we discuss the problem of representing default rules by means of a suitable coherent conditional probability, defined on a family of conditional events. An event is singled-out (in our approach) by a proposition, that is a statement that can be either true or false; a conditional event is consequently defined by means of two propositions and is a 3-valued entity, the third value being (in this context) a conditional probability

Introduction and notations

I

Territory, environment, and healthiness in traditional food choices: Insights into consumer heterogeneity

Traditional foods are facing new market challenges tied to current trends in food habits and their determinants, such as the decline of domestic food preparation, the increased demand for convenience foods, the increasing importance of industrial food production, and the evolution of regulations on food safety. In this context our study aims at improving the knowledge of consumer segments in traditional foods market in order to develop better marketing strategies. The preferences for different credence attributes are investigated applying a latent class choice model to the extra-virgin olive oil market in Italy. Results show the existence of a marked heterogeneity of preferences, which determines the presence of both vertical and horizontal differentiation of the product