Breaking de Morgan's law in counterfactual antecedents

The main goal of this paper is to investigate the relation between the meaning of a sentence and its truth conditions. We report on a comprehension experiment on counterfactual conditionals, based on a context in which a light is controlled by two switches. Our main finding is that the truth-conditionally equivalent clauses (i) "switch A or switch B is down" and (ii) "switch A and switch B are not both up" make different semantic contributions when embedded in a conditional antecedent. Assuming compositionality, this means that (i) and (ii) differ in meaning, which implies that the meaning of a sentential clause cannot be identified with its truth conditions. We show that our data have a clear explanation in inquisitive semantics: in a conditional antecedent, (i) introduces two distinct assumptions, while (ii) introduces only one. Independently of the complications stemming from disjunctive antecedents, our results also challenge analyses of counterfactuals in terms of minimal change from the actual state of affairs: we show that such analyses cannot account for our findings, regardless of what changes are considered minimal

Context Dependence and Procedural Meaning: The Semantics of Definites

This thesis argues that there is a theoretically interesting connection between members of the intuitive category of context-dependent expressions, including "we", "tall", "local", "every man", "the woman", "it", "those donkeys" and so on. A treatment of the linguistic meaning of these expressions will be proposed based on the idea that their use raises issues for the audience about the proper understanding of the utterances in which they occur. The proposal will be developed in terms of a semantics for questions, which draws on the idea that to know the meaning of a question is to know what would count as an answer. It can be summarised along similar lines: to know the meaning of a context-dependent expression is to know what properties or relations (of the appropriate type) it could be used to express. The framework in which this idea will be developed can account for why the expressions that are given this issue-based treatment can also be given dependent, bound readings. The class of definite expressions, including descriptions and pronouns, is analysed in detail. A quantificational approach, where the determiner is existential, is assumed for all forms of definiteness. In all cases, the restrictor is interpreted by an atomic definite concept. The audience's grasp of the properties which definite concepts express is the result of inferential processes which take the linguistic meaning of a definite expression as input. These processes are constrained by pragmatic principles. The analysis of context-dependent expressions is extended to account for dependent interpretations. A treatment of donkey sentences that accounts for their variable quantificational force is shown to follow naturally from the analysis. A pragmatic account of infelicitous uses of definites is provided and shown to compare favourably with that provided by dynamic semantic theories. Also, a novel treatment of plural definites is provided which accounts for their variable quantificational force

Counterfactual Donkey Sentences: A Strict Conditional Analysis

We explore a distinction between 'high' and 'low' readings in counterfactual donkey sentences and observe three open issues in the current literature on these sentences: (i) van Rooij (2006) and Wang (2009) make different empirical predictions with respect to the availability of 'high' donkey readings. We settle this question in favour of van Rooij’s (2006) analysis. (ii) This analysis overgenerates with respect to weak readings in so-called 'identificational' donkey sentences. We argue that pronouns in these sentences should not be analysed as donkey pronouns, but as concealed questions or as part of a cleft. (iii) The analysis also undergenerates with respect to NPI licensing in counterfactual antecedents. We propose a strict conditional semantics for counterfactual donkey sentences that derives the correct licensing facts

Real impossible worlds : the bounds of possibility

Lewisian Genuine Realism (GR) about possible worlds is often deemed unable to accommodate impossible worlds and reap the benefits that these bestow to rival theories. This thesis explores two alternative extensions of GR into the terrain of impossible worlds. It is divided in six chapters. Chapter I outlines Lewis’ theory, the motivations for impossible worlds, and the central problem that such worlds present for GR: How can GR even understand the notion of an impossible world, given Lewis’ reductive theoretical framework? Since the desideratum is to incorporate impossible worlds into GR without compromising Lewis’ reductive analysis of modality, Chapter II defends that analysis against (old and new) objections. The rest of the thesis is devoted to incorporating impossible worlds into GR. Chapter III explores GR-friendly impossible worlds in the form of set-theoretic constructions out of genuine possibilia. Then, Chapters IV-VI venture into concrete impossible worlds. Chapter IV addresses Lewis’ objection against such worlds, to the effect that contradictions true at impossible worlds amount to true contradictions tout court. I argue that even if so, the relevant contradictions are only ever about the non-actual, and that Lewis’ argument relies on a premise that cannot be nonquestion- beggingly upheld in the face of genuine impossible worlds in any case. Chapter V proposes that Lewis’ reductive analysis can be preserved, even in the face of genuine impossibilia, if we differentiate the impossible from the possible by means of accessibility relations, understood non-modally in terms of similarity. Finally, Chapter VI counters objections to the effect that there are certain impossibilities, formulated in Lewis’ theoretical language, which genuine impossibilia should, but cannot, represent. I conclude that Genuine Realism is still very much in the running when the discussion turns to impossible worlds

Early Literacy Achievements, Population Density and the Transition to Modern Growth

The transition from economic stagnation to sustained growth is often modelled thanks to “population-induced” productivity improvements, which are assumed rather than derived from primary assumptions. In this paper the effect of population on productivity is derived from optimal behavior. More precisely, both the number and location of education facilities are chosen optimally by municipalities. Individuals determine their education investment depending on the distance to the nearest school, and also on technical progress and longevity. In this setting, higher population density enables the set-up costs of additional schools to be covered, opening the possibility to reach higher educational levels. Using conterfactual experiments we find that one third of the rise in literacy can be directly attributed to the effect of density, while one sixth is linked to higher longevity and one half to technical progress. Moreover, the effect of population density in the model is consistent with the available evidence from England, where it is shown that schools were established at a high rate over the period 1540-1620.Human Capital; Population Density; Education Investment;School Location;Technical Progress

Counterfactuals and Undefinedness: Homogeneity vs. Supervaluations

Theories of counterfactuals agree on appealing to a relation of comparative similarity, but disagree on the quantificational force of counterfactuals. We report on two experiments testing the predictions of three main approaches: universal theories, homogeneity theories, and single-world selection theories (plus supervaluations over selection functions). The critical cases in our experiment were constructed so as to discriminate between the three theories. Our results provide empirical support for the selectional theories, while challenging the other two approaches

The metaphysician's free lunch

vii, 141 leaves : ill. ; 28 cm.In this paper, I begin to develop a theory called Paradise on the Cheap - in so doing, I intend to provide a rival to David Lewis' modal realism. Paradise on the Cheap grounds possibilia in the features of the actual world; and so, it does not require realist commitments to the existence of non-actual worlds and individuals. I explain modality, conterfactuals, content, and properties in terms of recombinations of actual-world features, second-order mathematical schemata, and the similarity relations which hold between these things and parts of the actual world. Because the ontology of Paradise on the Cheap promotes unity and economy of theory to a greater extent than does model realism's ontology, I argue that we should accept the former theory instead of the latter. Moreover, I address the question of whether inference to the best explanation is an argumentative strategy that is even available to modal realists

The Impact of Camel Transportation on the Livelihood of Pastoralists: In Berahle Woreda, Afar Regional State of Ethiopia

The main objective of this study was to assess the impact of camel salt transportation service on the livelihood of pastoralists in Berahle woreda, Afar regional state of Ethiopia. A cross sectional primary data of 250 sample households (including 115 camel owners and 135 camel non-owners) was used for analysis. Propensity score matching (PSM) method was implemented to capture the livelihood contribution of camel salt transportation service for the camel owner pastoral households in the study area. Four matching algorithms (Nearest- Neighbour, Kernel, Radius and Stratification) were used for estimation and their result was consistent which shows their robustness. Income, livestock ownership and fixed asset formation of the households were used as livelihood indicators to compare the livelihood differences between the camel owner and non-owner households. Accordingly, a positive and significant difference was found in two of the livelihood indicators i.e., income and livestock ownership, but not fixed asset holdings between the two groups of households. The paper has also tried to identify the main determinant factors influencing the camel rent decision of the camel owner pastoral households using ordered probit regression model. The result reveals that, literacy of the household head and number of camels owned by the household are the factors affecting household head’s decision to rent out his/her camels for other salt transporters or not. Another focus of the study was, identifying the main beneficiaries of the salt mine among the salt trade value chain participants and calculating the profit percentage share of the salt transporters, using descriptive statistics. Based on the analysis, the salt transporters were found to be the main beneficiaries among the salt trade value chain participants