Several recent results on the aggregation of judgments over logically connected propositions show that, under certain conditions, dictatorships are the only propositionwise aggregation functions generating fully rational (i.e., complete and consistent) collective judgments. A frequently mentioned route to avoid dictatorships is to allow incomplete collective judgments. We show that this route d...

In the absence of an objective contingency, psychological studies have shown that people nevertheless attribute outcomes to their own actions. Thus, by wrongly inferring control in chance situations people appear to hold false beliefs concerning their agency, and are said to succumb to an illusion of control (IoC). In the current article, we challenge traditional conceptualizations of the illus...

Being able to assess one’s own learning rate is essential for optimal learning. Can students accurately assess their learning rate, and is the timing of judgments of improvement important? In this experiment, students were to estimate their learning rate on each trial, either before the trial, or immediately after. If students typically make these judgments before embarking on further study, ac...

How can di¤erent individuals’probability assignments to some events be aggregated into a collective probability assignment? Classic results on this problem assume that the set of relevant events –the agenda –is a -algebra and is thus closed under disjunction (union) and conjunction (intersection). We drop this demanding assumption and explore probabilistic opinion pooling on general agendas. On...

Judgment aggregation is a social choice method for aggregating information on logically related issues. In distance-based judgment aggregation, the collective opinion is sought as a compromise that satisfies several structural properties. It would seem that the standard conditions on distance and aggregation functions are strong enough to guarantee existence of feasible procedures. In this pape...

This introduces the symposium on judgment aggregation. The theory of judgment aggregation asks how several individuals’judgments on some logically connected propositions can be aggregated into consistent collective judgments. The aim of this introduction is to show how ideas from the familiar theory of preference aggregation can be extended to this more general case. We …rst translate a proof o...

We introduce a number of logics to reason about collective propositional attitudes that are defined by means of the majority rule. It is well known that majoritarian aggregation is subject to irrationality, as the results in social choice theory and judgment aggregation show. The proposed logics for modelling collective attitudes are based on a substructural propositional logic that allows for ...

The book of Revelation is a remarkably well-constructed literary piece, containing a mu1 tiplici ty of neatly intertwining patterns. Such patterns are more than simply demonstrations of aesthetic taste and compositional skill, and they also transcend the useful purpose of serving as mnemonic devices. Indeed, in a forthright and forceful way they highlight various aspects of the book's theologic...

The paper studies the interrelationships between the social-theoretic problems of preference and judgment aggregation from the perspective of formal logic. The result of the paper is twofold. On the one hand, preference aggregation on total preorders is proven equivalent to the aggregation of specific types of judgments. On the other hand, judgment aggregation on propositional logic is proven e...