Does rationality require logical omniscience? Our best formal theories of rationality imply that it does, but our ordinary evaluations of rationality seem to suggest otherwise. This paper aims to resolve the tension by arguing that our ordinary evaluations of rationality are not only consistent with the thesis that rationality requires logical omniscience, but also provide a compelling rationale for accepting this thesis in the first place. This paper also defends an account of apriori justification for (...) logical beliefs that is designed to explain the rational requirement of logical omniscience. On this account, apriori justification for beliefs about logic has its source in logical facts, rather than psychological facts about experience, reasoning, or understanding. This account has important consequences for the epistemic role of experience in the logical domain. In a slogan, the epistemic role of experience in the apriori domain is not a justifying role, but rather an enabling and disabling role. (shrink)

In discussions surrounding epistemology and rationality, it is often useful to assume an agent is rational or ideally rational. Often, this ideal rationality assumption is spelled out along the following lines: -/- 1. The agent believes everything about a situation which the evidence entitles her to believe and nothing which it does not. -/- 2. The agent believes all the logical consequences of any of her beliefs. -/- 3. The agent knows her own mind: if she believes (...) P, she believes that she believes P; and if she doesn't believe P, she believes that she doesn't believe P. -/- 4. The agent believes nothing of the form 'P and it is not the case that P.' -/- 5. If an agent's background belief-set satisfies 1-4 and if rationality requires the agent to add P to her belief-set, then the resulting belief-set will also satisfy 1-4. -/- While individually plausible, there are cases in which holding on to 1-5 generates paradox. Some resolve such paradoxical cases by granting 1-5 but arguing while ideally rational agents can exist, they can't possibly ever find themselves in such a situation: such case descriptions are epistemically incoherent. Others allow that rational agents can coherently find themselves in such odd circumstances, and argue that it's more reasonable to weaken our concept of ideal rationality and give up premise (2) above. However, this strategy has also been rejected. My aim in this paper is to defend the utility of positing an ideally rational agent in such paradoxical circumstances. I argue in such cases we should give up (2), in particular the assumption that (necessarily) if an ideally rational agent believes both P and the conditional, if P then Q, then she believes Q.. What's important is to hold on to the goal of positing ideal rationality: to maximize the amount of true or probably true information a thinker can justifiably believe in a given circumstance. Normally that will mean holding on to (2), but these unusual paradoxical cases are best handled by giving up (2). (shrink)

In this paper, I explore how the ideal rationality-based account of propositional justification impacts our understanding of the relation between propositional and doxastic justification. The ideal rationality-based account sits uncomfortably with the widely accepted claim that propositional justification is necessary for doxastic justification. In particular, the combination of the necessity claim and the ideal rationality-based account of propositional justification entails that some plausible doxastic attitudes are doxastically unjustified and thereby severs epistemic justification from connections (...) with epistemic responsibility and the competent formation of beliefs. Thus, those who endorse both the necessity claim and the ideal rationality-based account of propositional justification will be forced to give up either their account of propositional justification or the necessity claim. I argue that there is good reason to give up the ideal rationality-based account of propositional justification instead of the necessity claim. This result indicates that an adequate account of propositional justification should be sensitive to the agent’s cognitive capacities. If propositional justification should be understood in this way, then the widely accepted explanation of doxastic justification in terms of propositional justification is not promising either. This is because an agent’s cognitive capacities and limitations play a prominent role in understanding propositional justification. Instead, I argue that, at the explanatory level, propositional justification relies on doxastic justification. (shrink)

Formal epistemologists often claim that our credences should be representable by a probability function. Complete probabilistic coherence, however, is only possible for ideal agents, raising the question of how this requirement relates to our everyday judgments concerning rationality. One possible answer is that being rational is a contextual matter, that the standards for rationality change along with the situation. Just like who counts as tall changes depending on whether we are considering toddlers or basketball players, perhaps what (...) counts as rational shifts according to whether we are considering ideal agents or creatures more like ourselves. Even though a number of formal epistemologists have endorsed this type of solution, I will argue that there is no way to spell out this contextual account that can make sense of our everyday judgments about rationality. Those who defend probabilistic coherence requirements will need an alternative account of the relationship between real and ideal rationality. (shrink)

The underrepresentation of women, people of color, and especially women of color—and the corresponding overrepresentation of white men—is more pronounced in philosophy than in many of the sciences. I suggest that part of the explanation for this lies in the role played by the idealized rational self, a concept that is relatively influential in philosophy but rarely employed in the sciences. The idealized rational self models the mind as consistent, unified, rationally transcendent, and introspectively transparent. I hypothesize that acceptance of (...) the idealized rational self leads philosophers to underestimate the influence of implicit bias on their own judgments and prevents them from enacting the reforms necessary to minimize the effects of implicit bias on institutional decision-making procedures. I consider recent experiments in social psychology that suggest that an increased sense of one’s own objectivity leads to greater reliance on bias in hiring scenarios, and I hypothesize how these results might be applied to philosophers’ evaluative judgments. I discuss ways that the idealized rational self is susceptible to broader critiques of ideal theory, and I consider some of the ways that the picture functions as a tool of active ignorance and color-evasive racism. (shrink)

A number of formal epistemologists have argued that perfect rationality requires probabilistic coherence, a requirement that they often claim applies only to ideal agents. However, in “Rationality as an Absolute Concept,” Roy Sorensen contends that ‘rational’ is an absolute term. Just as Peter Unger argued that being flat requires that a surface be completely free of bumps and blemishes, Sorensen claims that being rational requires being perfectly rational. When we combine these two views, though, they lead to (...) counterintuitive results. If being rational requires being perfectly rational, and only the probabilistically coherent are perfectly rational, then this indicts all ordinary agents as irrational. In this paper, I will attempt to resolve this conflict by arguing that Sorensen is only partly correct. One important sense of ‘rational’, the sanctioning sense of ‘rational’, is an absolute term, but another important sense of ‘rational’, the sense in which someone can have rational capacities, is not. I will, then, show that this distinction has important consequences for theorizing about ideal rationality, developing an account of the relationship between ordinary and ideal rationality. Because the sanctioning sense of ‘rational’ is absolute, it is rationally required to adopt the most rational attitude available, but which attitude is most rational can change depending on whether we are dealing with ideal agents or people more like ourselves. (shrink)

I develop a broadly reliabilist theory of non-ideal epistemic rationality and argue that if it is correct we should reject the recently popular idea that the standards of non-ideal epistemic rationality are mere social conventions.

The increasingly wide spread use of RCM, rational choice modeling, and RCT, rational choice theory, in disciplines like economics, law, ethics, psychology, sociology, political science, management facilitates interdisciplinary exchange. This is a great achievement. Yet it nurtures the hope that a unified account of rational active choice making might arise from ‘reason’ in terms of intuitively appealing axioms. Such ‘rationalist’ characterizations of rational choice neglect real human practices and empirical accounts of those practices. This is theoretically misleading and practically dangerous. (...) Searching for a wide reflective equilibrium, WRE, on RCT in evidence-oriented ways can explicate ‘rational’ without rationalism. (shrink)

In Educating Reason, Harvey Siegel presented the case regarding rationality and critical thinking as fundamental education ideals. In Rationality Redeemed? , a collection of essays written since that time, he develops this view, responds to major criticisms raised against it, and engages those critics in dialogue. In developing his ideas and responding to critics, Siegel addresses main currents in contemporary thought, including feminism, postmodernism and multiculturalism.

According to Popper's rationality principle, agents act in the most adequate way according to the objective situation. I propose a new interpretation of the rationality principle as consisting of an idealization and two abstractions. Based on this new interpretation, I critically discuss the privileged status that Popper ascribes to it as an integral part of all social scientific models. I argue that as an idealization, the rationality principle may play an important role in the social sciences, but (...) it also has inherent limitations that inhibit it from having the privileged status that Popper ascribes to it in all cases. (shrink)

Needed for such dialogue games as dialectic are appropriate standards of fairness and rationality. The rules of procedure of dialectic must describe a game playable by actual human participants. The present paper centers on certain idealizations of the dialectician that are not allowable.

A striking thesis lies at the core of Davidson's philosophy: when we attribute intentional content to another creature's mental states and speech acts, we must treat the creature as largely conforming to our own rational norms. I will discuss how this thesis informs Davidson's treatment of rationality and intentionality. After reviewing some historical background, I present basic aspects of Davidson's position. I then examine various worries about the position. I conclude by highlighting some key Davidsonian insights into rationality.

When we read, we do not fixate on each word! How does that work? By deep theory those sorts of decisions must be the result of complex decisions involving the specific “word,” the linguistic context in which it appears, and visual information. But is reading really all that difficult? After all, simple heuristics models of reading seem to do sort of okay by only considering the additive effects of word and context. Entropy measures do well at predicting word “skipping” and (...) suggest that “word frequency” may play the dominant role in the “decision” to skip or not skip! (shrink)

Probabilistic coherence is not an absolute requirement of rationality; nevertheless, it is an ideal of rationality with substantive normative import. An idealized rational agent who avoided making implicit logical errors in forming his preferences would be coherent. In response to the challenge, recently made by epistemologists such as Foley and Plantinga, that appeals to ideal rationality render probabilism either irrelevant or implausible, I argue that idealized requirements can be normatively relevant even when the ideals are (...) unattainable, so long as they define a structure that links imperfect and perfect rationality in a way that enables us to make sense of the notion of better approximations to the ideal. I then analyze the notion of approximation to the ideal of coherence by developing a generalized theory of belief functions that allows for incoherence, and showing how such belief functions can be ordered with regard to greater or lesser coherence. (shrink)

Mackenzie, this journal, this issue, convincingly shows that in certain dialogue games (commitment games) there are procedural restrictions similar to those that I impose on rationality idealizations. But, whereas my rationality analysis is set in the context of belief games, commitment games do not postulate beliefs. Is this significant? I suggest that mackenzie thinks that it is. There follow discussions of Psychologism and Behaviourism.

All of us have personal ideals. We are committed to being good (enough) friends, parents, neighbors, teachers, citizens, human beings, and more. In this paper, I examine the thick and thin aspects of these ideals: (i) their substance (to internalize an ideal is to endorse a particular way of being) and (ii) their accountability to reason (to internalize an ideal is to assume that this is really a good way to be). In considering how these two aspects interact (...) in the ideal of rational agency, I address two philosophical debates that are generally conducted in isolation of each other: (i) debates over the anti-ideal of normative “fetishism” and (ii) debates over whether acting for a reason is acting “under the guise of the good.” In the final two sections of the paper, I further explore the relations among the thick and the thin. I note the role that coherence constraints play in the process whereby our ideals gain determinacy. At the same time, I argue, our ideals constrain the possibility and desirability of coherence. This has implications for a third debate: the debate over the possibility of moral dilemmas. (shrink)

The Ideal of a Rational Morality collects the most important essays by the distinguished moral philosopher Marcus G. Singer. Its guiding theme is the concept of a morality based in reason, which is presupposed in ordinary moral contexts and provides an ideal for improving ordinary morality and correcting moral judgements. Singer makes compelling claims that certain fundamental presuppositions are inescapable in moral thought, that fundamental moral principles can be proved, and that the concepts of truth and 'common sense' (...) are essential to ethics.Subsequent essays proceed to analyse the nature of value judgements and of moral judgements, emphasising the vital importance of certain basic distinctions. There is a discussion of race and racism, presenting new ideas about the nature of both. The relation of law to morality is considered, as are the relations between moral judgements of individual persons and the actions and moral judgements of institutions, leading to an examination of the relations between moral issues and social problems. A particularly well-known essay on the Golden Rule is reproduced, where Singer's analysis shows it to be applicable and defensible as it stands, and finally the nature of happiness is explored through a discussion of John Stuart Mill's moral philosophy.Each essay is supplemented by a set of Additional Notes and Comments, with supplementary pieces and response to criticisms. The Ideal of a Rational Morality will be fascinating reading for anybody seeking rigour and clarity in ethical issues. (shrink)

The Ideal of Rationality presents an evaluation of all the main varieties of rationalism, in clear and jargon-free language. Different notions of rationality - such as means-end, conception, hedonism, and the evil-avoidance view - are examined and rejected, in favor of the theory that to act rationally is to 'act for the best', a theory Nathanson characterizes as "critical pluralism". Among present-day thinkers whose ideas are scrutinized are Richard Brandt, Bernard Gert, Gilbert Harman, John Kekes, Robert Nozick, (...) Karl Popper, and John Rawls. (shrink)

The Ideal of a Rational Morality collects the most important essays by the distinguished moral philosopher Marcus G. Singer. Its guiding theme is the concept of a morality based in reason, which is presupposed in ordinary moral contexts and provides an ideal for improving ordinary morality and correcting moral judgements. Singer makes compelling claims that certain fundamental presuppositions are inescapable in moral thought, that fundamental moral principles can be proved, and that the concepts of truth and 'common sense' (...) are essential to ethics. (shrink)

The notion of an ideal reasoner has several uses in epistemology. Often, ideal reasoners are used as a parameter of (maximum) rationality for finite reasoners (e.g. humans). However, the notion of an ideal reasoner is normally construed in such a high degree of idealization (e.g. infinite/unbounded memory) that this use is unadvised. In this dissertation, I investigate the conditions under which an ideal reasoner may be used as a parameter of rationality for finite reasoners. (...) In addition, I present and justify the research program of computational epistemology, which investigates the parameter of maximum rationality for finite reasoners using computer simulations. (shrink)

When should we judge that a person is leading or has led a happy life? By what standard? What legitimate criticism can be brought to bear on individual ideals? ;I argue that we have three conceptions of longterm happiness: the contentment conception , the affirmation conception , and the justified affirmation conception . The relation between them is one of inclusion. All three have been proposed as ideals: as candidates for . Evaluative happiness is a comprehensive good, i.e., sufficient for (...) realizing the good life. ;The happy life is one in which a person is disposed to affirm his or her life justifiaby. So the best standard of justification, consistent with our concept of a person and affirmation, will provide the best account of evaluative happiness. ;To affirm one's life is to judge that it is good: that one's important desires are satisfied and successful , and to be satisfied as a consequence. The capacity for affirmation is necessary for personhood, i.e., every person holds some individual ideal. ;Contentment is possible without affirmation. So the contentment conception is inadequate as a conception of evaluative happiness. ;Coherence is a minimal requirement for any adequate standard of justification. Affirmation is consistent with incoherence. So the affirmation conception is not defensible. ;Rationality is necessary for realizing the good life. The subjectivist standard of justification is too strong and/or too weak . Subjectivism is thus discredited. ;I argue for an account of happiness as rational affirmation. This standard is neither subjective nor objective . There are some things one has reason to value if one values anything: the goods of rational affirmation. Every person holds some individual ideal. So every person has reason to value the goods of rational affirmation. ;'Radical objectivism' is incoherent: there could be no good objective standard of justification. What is important is what is important to persons. (shrink)

In The Idea of Justice Amartya Sen criticises ‘transcendental institutionalism’ for entertaining notions of ‘ideal justice’ that, are neither necessary nor sufficient for the advancement of justice in the real world. Sen argues in favor of a ‘realization- focused’ and ‘comparative’ understanding of justice that he associates with the names of Adam Smith, Marx, and J. S. Mill. Conceptions of ideal justice. Sen believes, are useless since in practice we do not need them to advance justice. And they (...) are ‘infeasible’ because all conceptions of ideal justice can be reasonably rejected for one reason or other. I shall address both complaints in turn and maintain that Sen’s rigid contra-position of ideal and comparative justice is overstated. It will also be discussed how the institutional focus of ‘transcendental institutionalism’ links up with the need for an ideal conception of justice. Finally, some implications of rational dissent about justice and two common strategies to deal with it will be discussed. (shrink)

A collection of essays by prestigious authors discussing the work of Bernard Gert, Stone Professor of Intellectual and Moral Philosophy at Dartmouth College.

The purpose of this paper is to explore some of the moral problems that arise out of the interrelationships between individuals and formal organizations in our society. In particular, I shall be concerned with the moral implications of the so-called ideal of rationality of formal organizations with regard to, on the one hand, the obligations of individuals both inside and outside an organization to that organization and, on the other hand, the moral responsibilities of organizations to individuals and (...) to the public at large. I shall argue that certain facets of the organizational ideal are incompatible with the ordinary principles of morality and that the dilemma created by this incompatibility is one source of alienation in our contemporary, industrial society. The very conception of a formal organization or bureaucracy presents us with an ideological challenge that desperately needs to be met in some way or other. (shrink)

Drawing general inferences on the basis of single-case and small- n studies is often seen as problematic. This article suggests a logic of generalization based on thinly rationalistic social mechanisms. Ideal-type mechanisms can be derived from empirical observations in one case and, based on the assumption of thin rationality, used as a generalizing bridge to other contexts with similar actor constellations. Thus, the “portability” builds on expectations about similar mechanisms operating in similar contexts. We present the general logic (...) behind such “rationalistic generalization” and relate it to other ideas about generalization from single-case studies. (shrink)

The research is devoted to the problem of philosophically justifying rationality, which inevitably takes the form of a circular argument: to define what rationality is, we must refrain from referring to its criteria, which must be rationally defined beforehand. This epistemic circle is compared to the so-called “experimenter’s regress”. The experimenter’s regress involves reasoning in which judging the correctness of obtained scientific results can only be based on the correctness of the procedure of obtaining them and judging the (...) correctness of the procedure of obtaining them can only be done by relying on the obtained results. From the perspective of social researchers of science, the experimenter’s (and the theoretician’s) regress casts a shadow on traditional theories of rationality that take science as a model of rational knowledge. The research analyzes the experimenter’s regress in the context of virtuous and vicious circles. It is shown that the experimenter’s regress is overcome by turning to external factors. These factors are proposed to be interpreted in terms of extended rationality. By analyzing the experimenter’s regress, social epistemologists consciously or unconsciously rationalize these “external” factors and enrich the concept of rationality. This allows qualifying the circle described by rationality in defining itself as virtuous and the work of the epistemologist as a progressive activity, during which both epistemology and its subject undergo qualitative changes. (shrink)

Woods' paper “Ideals of Rationality in Dialogue” raises six problems for dialogue theory. Woods is right about the seriousness of the problems, but one school of dialogue, that stemming from the work of Charles Hamblin, avoids each of Woods' problems by using commitment instead of belief and by using only immediate logical relations. This paper summarises the reasons Hamblin's school took this course, and explains how Woods' problems are thereby avoided.

Hilary Greaves and David Wallace argue that conditionalization maximizes expected accuracy and so is a rational requirement, but their argument presupposes a particular picture of the bridge between rationality and accuracy: the Best-Plan-to-Follow picture. And theorists such as Miriam Schoenfield and Robert Steel argue that it's possible to motivate an alternative picture—the Best-Plan-to-Make picture—that does not vindicate conditionalization. I show that these theorists are mistaken: it turns out that, if an update procedure maximizes expected accuracy on the Best-Plan-to-Follow picture, (...) it's guaranteed to maximize expected accuracy on the Best-Plan-to-Make picture as well, in which case moving from the former to the latter can't help us avoid the conclusion that conditionalization is a rational requirement. If there's a problem with Greaves and Wallace’s argument, it must lie elsewhere. (shrink)

Formally inclined epistemologists often theorize about ideally rational agents—agents who exemplify rational ideals, such as probabilistic coherence, that human beings could never fully realize. This approach can be defended against the well-known worry that abstracting from human cognitive imperfections deprives the approach of interest. But a different worry arises when we ask what an ideal agent should believe about her own cognitive perfection (even an agent who is in fact cognitively perfect might, it would seem, be uncertain of this (...) fact). Consideration of this question reveals an interesting feature of the structure of our epistemic ideals: for agents with limited information, our epistemic ideals turn out to conflict with one another. This suggests that we must revise the way we see ideal agents in epistemic theorizing. (shrink)

This is a collection of thirteen essays, most of which first appeared in the mid-1980s, though one dates from 1963 and one, presented in 1993, was first published in 2000. The essays have as their common thread Singer’s well-known commitment to a rational morality, but beyond that it is difficult to detect a theme or progression among them.

Contemporary economic theory is generally regarded as a scientific or at least potentially so. The replacing of the cardinal theory of utility measurement by the ordinal theory was supposed to prepare the groundwork for economics as a genuine science. But in adopting the ordinal approach, theorists saw fit to anchor ordinal theory to axioms of choice founded on principles of rational behavior. Behavior according to these axioms was embodied in the ideal type model of rational economic man. This model (...) served the basis for scientific explanation of the choices made by actual economic agents. I argue though that the postulate of rationality is a normative principle and that this compromises the scientific pretensions of economic theory. Yet the theorist must rely on this principle to formulate predictive and explanatory theories. This raises questions as to whether it is possible that economic theory satisfy the same kind of scientific criteria set down for research in the natural sciences. (shrink)