In this study, we present a cost-sharing rule for cost-sharing problems. This rule prescribes the same allocations in a problem and in its dual one. Moreover, in some specific problems it gives the same allocations as the serial cost-sharing rule (Moulin and Shenker, Econometrica, 60, 1009–1037, 1992) does in a related problem. That is why we call it as the self-dual serial cost-sharing rule. We give two (...) axiomatizations of this new rule and another one for the serial cost-sharing rule. (shrink)

This paper proposes an experimental test to evaluate the performance of the serial cost sharing rule, originally proposed by Shenker [Sigmetrics, 241–242 (1990)] and then analyzed by Moulin and Shenker [Econometrica 60, 1009–1037 (1992)]. We report measures of the performance and efficiency of the serial mechanism by comparing the choices and payoffs attained by the subjects to the expected equilibrium allocations. Experimental evidence shows that learning is needed for the subjects to converge to the equilibrium (...) strategy. However, in terms of efficiency, the serial mechanism leads to almost efficient allocations. (shrink)

The information explosion and digital modes of learning often combine to inform the quest for the best ways of transforming information in digital form for pedagogical purposes. This quest has become more urgent and pervasive with the ‘turn’ to online learning in the context of COVID-19. This can result in linear, asynchronous, transmission-based modes of teaching and learning which commodify, package and deliver knowledge for individual ‘customers’. The primary concerns in such models are often technical and economic – technology as (...) a cost-effective ‘solution’ to educational challenges. In this paper I argue for the importance of dialogic learning space in teaching and learning by means of Information and Communication Technologies, whether in the form of fully online learning, blended learning or face-to-face encounters using ICT affordances. Although the 20th Century theorists Mikhail Bakhtin (1895–1975) and Hans-Georg Gadamer (1900–2002) produced their seminal works before the advent of ICTs, they were both concerned with the quality and authenticity of human engagement with texts and with other persons and contexts. Besides a shared interest in dialogue as an ontological feature of human life and being, they both used spatiotemporal concepts for understanding and interpreting texts. The article draws on Gadamer’s notions of dialogue and horizon, and Bakhtin’s notions of dialogue and chronotope, to conceptualize dialogic possibilities for online education. Its purpose is to provide a framework, grounded in Bakhtin’s and Gadamer’s ideas, for a dialogic approach to online teaching and learning in higher education. (shrink)

According to the eligibility theory of meaning, often attributed to David Lewis, the referent of a predicate is the property that best balances the twin constraints of charity and eligibility, where eligibility is a function of metaphysical naturalness. This sort of metasemantics, which is motivated by its ability to resolve problems of indeterminacy and secure shared reference between disputing parties, can be somewhat friendly towards revisionary theories, since highly natural properties can act as “reference magnets,” securing our reference despite some (...) mismatch with usage. In this paper, I apply these considerations to normative ethics and argue that the theory of rule utilitarianism achieves a high balance of charity and eligibility. I proceed by comparing rule utilitarianism to two of its well-known rivals, act utilitarianism and Rossian pluralism. I show how the former achieves a high degree of eligibility but only at a significant cost of charity, while the latter does the opposite, fitting very nicely with our considered judgments but at the price of very low eligibility. Rule utilitarianism, on the other hand, strikes a good balance between these extremes; it assigns to our core moral term a relatively natural property without doing too much damage to our moral convictions. Thus, rule utilitarianism should be regarded as a promising moral theory by any philosopher who takes seriously considerations of eligibility and naturalness. (shrink)

For-profit managed care organizations face decisions about cost sharing that can involve a tradeoff between the interests of investors and the interests of patients. No successful business can ignore the interests of its investors, but moral philosophy points to ethical reasons for managed care organizations to make patients’ health, rather than investors’ profit, their primary goal. One reason is the ethical obligation of all businesses to avoid wrongful exploitation of vulnerable customers. An insurance company’s cost-sharing policy (...) can exploit customers either by collecting an unfairly large amount of money from them or by unfairly deterring them from making claims for resources they medically need. Another reason stems from the fact that managed care organizations’ profits derive in part from the existence of artificial barriers to access to medicine, notably including patents. Putting a fence around a water well in the desert is legitimate only if doing so facilitates a financial arrangement that maximizes people’s access to water they need. Likewise, patents and other artificial barriers to access to medically necessary drugs are legitimate only if they are used to help finance access to medical resources people need. For these reasons, managed care organizations should make cost-sharing decisions that maximize the sustainable availability of effective drugs to patients who need them. (shrink)

Various kinds of consumer-driven reforms have been attempted over the last 20 years in an effort to rein in soaring costs of health care in the United States. Most are based on a theory of moral hazard, which holds that patients will over-utilize health care services unless they pay enough for them. Although this theory is a basic premise of conventional health insurance, it has been discredited by actual experience over the years. While ineffective in containing costs, increased cost- (...) class='Hi'>sharing as a key element of consumer-driven health care leads to restricted access to care, underuse of necessary care, lower quality and worse outcomes of care. This paper summarizes the three major problems of U.S. health care urgently requiring reform and shows how cost-sharing fails to meet that goal. (shrink)

The Trump Administration has exposed both the durability and vulnerability of the Patient Protection and Affordable Care Act's insurance reforms. One of the Administration's first strikes at “Obamacare” was to discontinue federal government payment of cost-sharing reductions, which insurers pay to low-income enrollees on the exchanges to reduce their out-of-pocket share of medical spending. The states struck back with a clever solution that could hold insurers and enrollees harmless. This article examines this strategy and why, while impressive, it (...) reaffirms larger problems with the ACA's market-based approach to health reform and the need for new pathways forward. (shrink)

Can evolutionary models explain food sharing in traditional human societies? Gurven's analysis cannot rule out any of the models (kin selection, reciprocal altruism, tolerated scrounging, costly signaling, or by-product mutualism), and quantitative partitioning of relative importance is not feasible. For now, the hypotheses seem like the proverbial blind men examining the elephant: each was partly in the right, and all were in the wrong!

Within the last decade, thousands of studies have described communication processes in and between organisms. Pragmatic philosophy of biology views communication processes as rule-governed sign-mediated interactions (rsi's). As sign-using individuals exhibit a relationship to following or not-following these rules, the rsi's of living individuals dier fundamentally from cause-and-effect reactions with and between non-living matter, which exclusively underlie natural laws. Umwelt thus becomes a term in investigating physiological influences on organisms that are not components of rsi's. Mitwelt is a term (...) for the investigation of all rsi's of organisms. Living organisms are never solus ipse subjects of semioses, but share common sets of rules and signs. Life depends decisively on symbiotic communities. Serial Endosymbiotic Theory proved that the evolution of the eukaryotic super-kingdom was a merger of anchestral bacteria. The integration of bacterial genomes into eukaryotic genomes was also a step from analog to symbolic genetic codes. Now we know, that so-called ‘junk DNA’ has higher order regulatory functions on genome architecture and protein coding DNA plays only the role of a structural vocabulary. (shrink)

Taking a Darwinian approach, we propose that people reason to detect free-riders on the Wason Selection task with the sharing-rule; If one receives the resource, one is an in-group member (standard), or If one is an in-group member, one receives the resource (switched). As predicted, taking the resource-provider's perspective, both undergraduates and children (11 to 12 years old) checked for the existence of out-group members taking undeserved resource. Changing the perspective to that of the resource-recipient did not alter (...) the selection pattern in undergraduates, although the prediction was that another type of free-riding -failure to share by resource-provider- would be checked as well. However, by removing confounding factors in the materials, both undergraduates and children checked for both types of free-riding, which fully supports the prediction. These results indicate that the sharing-rule elicits a thematic content effect that cannot be explained by preceding deontic reasoning theories. (shrink)

The use of autonomous weaponry in warfare has increased substantially over the last twenty years and shows no sign of slowing. Our chapter raises a novel objection to the implementation of autonomous weapons, namely, that they eliminate moral cost-sharing. To grasp the basics of our argument, consider the case of uninhabited aerial vehicles that act autonomously (i.e., LAWS). Imagine that a LAWS terminates a military target and that five civilians die as a side effect of the LAWS bombing. (...) Because LAWS lacks moral agency, and in particular the capacity for moral emotions, moral cost-sharing is limited to dead civilians and their loved ones. We argue that's unjust insofar as those responsible for unjust harm to others ought to share in those costs. Our worry expands to other strategic uses of AI, e.g., cyber warfare. This presents a dilemma: Either we design autonomous weaponry capable of moral emotions, or we limit the use of autonomous weaponry. The former undermines the risk-mitigation purpose of creating autonomous weaponry and expands the number of sentient individuals whose welfare is risked in war. The latter risks worsening combatant casualties and achieving strategic aims. (shrink)

Changes in healthcare financing increasingly rely upon patient cost-sharing to control escalating healthcare expenditures. These changes raise new challenges for physicians that are different from those that arose either under managed care or traditional indemnity insurance. Historically, there have been two distinct bases for arguing that physicians should not consider costs in their clinical decisions—an “aspirational ethic” that exhorts physicians to treat all patients the same regardless of their ability to pay, and an “agency ethic” that calls on (...) physicians to be trustworthy advisors to their patients. In the setting of greater patient cost-sharing, physicians' aspiration and agency roles increasingly conflict. Satisfactorily navigating the new terrain of consumer-driven healthcare requires physicians to consider these two roles and how they can best be reconciled so as to maximize quality of care while respecting the heterogeneity of patients' financial resources and willingness to pay. (shrink)

This chapter explores two questions in detail: How should we determine the threshold for costs that individuals are asked to bear through insurance premiums or care-related out-of-pocket costs, including user fees and copayments? and What is an adequate relationship between costs and benefits? This chapter argues that preventing impoverishment is a morally more urgent priority than protecting households against income fluctuations, and that many health insurance plans may not adequately protect individuals from health care costs that threaten to drop their (...) financial status below a decent minimum. A design that places greater emphasis on preventing impoverishment and finances the achievement of that goal by reducing unnecessary subsidies to better-off households would better accord with a sufficientarian approach to health care. -/- . (shrink)

When do you have to sacrifice life and limb, time and money, to prevent harm to others? When must you save more people rather than fewer? These questions might arise in emergencies involving strangers drowning or trapped in burning buildings, but they also arise in our everyday lives, in which we confront opportunities to donate time or money to help distant strangers in need of food, shelter, or medical care. With the resources available, we can provide more help--or less. -/- (...) In The Rules of Rescue, Theron Pummer argues that we are often morally required to engage in effective altruism, directing altruistic efforts in ways that help the most. Even when the personal sacrifice involved makes it morally permissible not to help at all, he contends, it often remains wrong to provide less help rather than more. Using carefully crafted examples, he defends the view that helping distant strangers is more morally akin to rescuing nearby strangers than most of us realize. The ubiquity of opportunities to help distant strangers threatens to make morality extremely demanding, and Pummer argues that it is only thanks to adequate permissions grounded in considerations of cost and autonomy that we may pursue our own plans and projects. He ultimately concludes that many of us are required to provide no less help over our lives than we would have done if we were effective altruists. (shrink)

It is commonly thought that when democratic states act wrongly, they should bear the costs of the harm they cause. However, since states are collective agents, their financial burdens pass on to their individual citizens. This fact raises important questions about the proper distribution of the state’s collective responsibility for its unjust policies. This article identifies two opposing models for sharing this collective responsibility in democracies: first, in proportion to citizens’ personal association with the unjust policy; second, by giving (...) each citizen an equal share of the costs. Proportional distribution is compatible with the principle of fairness. And yet, both in the literature and in political praxis we find many supporters for the equal sharing of the costs of unjust policies in democracies. How can equal distribution be defended on normative grounds? This article develops a defense that is grounded in citizens’ associative obligations. I argue that, at least in some democracies, one of the intrinsic values of the civic bond revolves around the joint formation and execution of worthy political goals. This social good generates the political associative obligation to accept an equal distribution of the costs of unjust policies. (shrink)

Until the late 19th century scientists almost always assumed that the world could be described as a rule-based and hence deterministic system or as a set of such systems. The assumption is maintained in many 20th century theories although it has also been doubted because of the breakthrough of statistical theories in thermodynamics (Boltzmann and Gibbs) and other fields, unsolved questions in quantum mechanics as well as several theories forwarded within the social sciences. Until recently it has furthermore been (...) assumed that a rule-based and deterministic system was also predictable if only the rules were known, but this assumption has now been undermined by modern chaos-theory describing rule-based and deterministic, but unpredictable systems, while catastrophe-theory delivers a set of types describing various kinds of instability and conditions for the stability of a given system. Hence the main trait in the theoretical development in the 20th-century science can be described as a basic modification and limitation of some of the fundamental and strong assumptions forwarded in the previous epochs of modern science. Ironically, the very same process has been a process in which the human capacity to intervene in nature has expanded dramatically and mainly with the help of the very same theories, and not least because they allow nature to be described and made manipulable on a lower level and a more fine-grained scale. While the overall theoretical consistency between the various theories has gone, the reach of human intervention in nature has increased based on quite new dimensions whether in the area of physics (e.g.: energy technologies, chemical technologies, nanotechnologies etc.) or biology (ge¬netic manipulation) or in the area of psychology, sociology and culture (artificial simulations of mental processes, new means of communication, implying changes in the social infrastructure and cultural behaviour etc.). While some of these changes and new conditions can be reflected from within the conceptual framework of rule-based systems, albeit more complex than formerly recognized, others seem to give rise to the question of whether there are »systems« and relations between different systems in the world which are not rule-based? For instance, it seems to be obvious that the notion of instability represents a major conceptual break with former theories of rule-based systems, as the stability of the latter is an axiomatically given property implied in the very notion of rule-based systems, while instability can only be the result of external influence which should be explained as the result of another rule-based sy¬stem. While there are no difficulties implied concerning the stability of rule-based systems, the notion of unstable states of a system raises the question of how there can be a system at all if there are no invariant stabilising principles? This is the first question which I will address. And I shall do so by taking two examples of such systems as my point of departure. The first example will be the computer and the second will be ordinary language. In both cases I will argue that the stability of these systems (which are both defined by the existence/presence of human intentions) are provided by the help of - differently organised - redundancy functions which both allow the maintenance of systems in unstable macro-states, suspension of previous rules, underdetermination and overdetermination and generation/emergence/creation of new rules more or less independent of previous rules by the help of optional recursions to the permanently accessible underlying levels as for instance the level of binary representation in computers. Since the notion of redundancy is both controversial as such and often avoided, the concept is discussed (as defined in Claude Shannon's mathematical theory of information and in the semiotic framework of J. J. Greimas) and leading to a more general definition in which the redundancy functions serve to overcome noisy conditions, but at the cost of rule-based stability, determination, and predictability. A second question will be how the notion of rule-generating systems relates to the notion of anticipatory systems and it will be argued that rule-generating systems share some features with an¬ticipatory systems and that the former from a certain viewpoint can be seen as a subclass of the latter, although anticipative features are not necessarily a part of the definition of rule-generating systems. On the other hand, it will be discussed whether anticipatory systems which are not rule-generating systems can exist and it will be argued that the capacity to anticipate is strongly limited if it is not part of a rule-generating system. Therefore, it is concluded that the most powerful anticipatory systems need to be rule-generating systems. (shrink)

Over the last decade, philosophers of science have extensively criticized the epistemic superiority of randomized controlled trials for testing safety and effectiveness of new drugs, defending instead various forms of evidential pluralism. We argue that scientific methods in regulatory decision-making cannot be assessed in epistemic terms only: there are costs involved. Drawing on the legal distinction between rules and standards, we show that drug regulation based on evidential pluralism has much higher costs than our current RCT-based system. We analyze these (...) costs and advocate for evaluating any scheme for drug regulatory tests in terms of concrete empirical benchmarks, like the error rates of regulatory decisions. (shrink)

This paper explores the conditions favouring or inhibiting the implementation of strategic corporate social responsibility policies in the context of global value chains. Using transaction cost theory, we specify the economic and behavioural issues raised by strategic CSR policies. We show that the existence of market rewards for such policies does not constitute a solution per se, but tends to increase the difficulties that value chain members face. Bringing TCT into the analysis of the diffusion of strategic CSR policies (...) in GVCs helps us to make different contributions. We first theoretically identify some limiting conditions of strategic CSR policies in GVCs. We also contribute to developing a more robust theoretical perspective for CSR in GVC research, which remains underdeveloped and mostly driven by empirical case studies. Finally, we shed light on new research questions and topics that could guide major theoretical and empirical investigations in the capacity of GVCs members to bypass the numerous difficulties involved in the implementation of strategic CSR policies. (shrink)

We often remember in the company of others. In particular, we routinely collaborate with friends, family, or colleagues to remember shared experiences. But surprisingly, in the experimental collaborative recall paradigm, collaborative groups remember less than their potential, an effect termed collaborative inhibition. Rajaram and Pereira-Pasarin (2010) argued that the effects of collaboration on recall are determined by “pre-collaborative” factors. We studied the role of 2 pre-collaborative factors—shared encoding and group relationship—in determining the costs and benefits of collaborative recall. In Experiment (...) 1, we compared groups of strangers who encoded alone versus together, before collaborating to recall. In Experiment 2, we compared groups of friends who encoded alone versus together, before collaborating to recall. We found that shared encoding abolished collaborative inhibition in both Experiments 1 and 2. But prior relationship did not influence collaborative inhibition over and above the effects of shared encoding. Regardless of encoding condition, collaborative group recall contained fewer intrusions than nominal group recall, and these benefits continued in subsequent individual recall. Our findings demonstrate that pre-collaborative factors—specifically shared encoding—have flow-on benefits for group and individual recall amount, but not recall accuracy. We discuss these findings in terms of self- and cross-cuing in collaborative recall. (shrink)

Cost-effectiveness analysis suggests that a society should allocate its health care budget in order to achieve the greatest total health for its budget. However, in ‘rescue’ cases, where an individual’s life is in immediate peril, reasoning in terms of cost-effectiveness can appear inhumane. Hence considerations of cost-effectiveness and of rescue appear to be in tension. However, by attending to the division of labour in medical decision making it is possible to see how cost-effectiveness analysis and rescue-style (...) reasoning are commonly combined in an ethically acceptable fashion. (shrink)

A rule for the acceptance of scientific hypotheses called 'the principle of cost-benefit dominance' is shown to be more effective and efficient than the well-known principle of the maximization of expected utility. Harvey 's defense of his theory of the circulation of blood in animals is examined as a historical paradigm case of a successful defense of a scientific hypothesis and as an implicit application of the cost-benefit dominance rule advocated here. Finally, various concepts of 'dominance' (...) are considered by means of which the effectiveness of our rule may be increased. (shrink)

A rule for the acceptance of scientific hypotheses called ‘the principle of cost-benefit dominance’ is shown to be more effective and efficient than the well-known principle of the maximization of expected (epistemic) utility. Harvey's defense of his theory of the circulation of blood in animals is examined as a historical paradigm case of a successful defense of a scientific hypothesis and as an implicit application of the cost-benefit dominance rule advocated here. Finally, various concepts of ‘dominance’ (...) are considered by means of which the effectiveness of our rule may be increased. (shrink)

PurposeThis paper examines the influence of leader humility on knowledge sharing intention. Drawing on social exchange theory, we test the direct and indirect mechanisms to explain the influence leader humility has on knowledge sharing intention.Design/Methodology/ApproachA two-wave, time-lagged field study was conducted. We surveyed 252 professional employees from Australia.FindingsResults show a significant direct, positive association between leader humility and knowledge sharing intention. While leader humility had a direct, positive association with affective trust in supervisor and work engagement, it (...) did not directly impact on organizational citizenship behaviors directed toward the individual. There were three SET-related, serial mediators in the relationship between leader humility and knowledge sharing intention. These were affective trust, work engagement, and OCB-I.Research Limitations/ImplicationsFuture studies should collect multi-source data such as peers’ or supervisors’ ratings of the focal respondents’ work engagement, OCB-I, and knowledge sharing behaviors to augment single-source data. Future studies could adopt an affect theory of social exchange to further explore the relationships tested in this study.Originality/ValueThis study contributes to the affect SET and knowledge management literature on how leadership behaviors impact the intention to share knowledge. Our study highlights the preference of the willingness to share knowledge with their co-workers is mediated by affective trust in their immediate supervisors, work engagement, and OCB-I that are equally important as treating their subordinates with humility. (shrink)

Combatants who attempt to obey the laws of war often have to take considerable risks in order to effectively discriminate between legitimate and illegitimate targets. Sometimes this task is made even more complicated by systemic factors which influence their ability to discriminate effectively without unduly risking their lives or the mission. If they fail to do so, civilians often pay the price. In this paper, I argue that to the extent that non-combatants benefit from the attempt to fight justly, and (...) to the extent that wars in which combatants attempt to fight justly can be understood as a system of social cooperation which produces both burdens and benefits, non-combatants have a responsibility to shoulder their fair share of these burdens. Thus, if combatants (and by extension enemy non-combatants) are disproportionately burdened in a conflict, non-combatants ought to take on some costs, for instance in order to reduce the strain imposed on combatants by systemic factors such as the availability and distribution of resources. (shrink)

Combatants who attempt to obey the laws of war often have to take considerable risks in order to effectively discriminate between legitimate and illegitimate targets. Sometimes this task is made even more complicated by systemic factors which influence their ability to discriminate effectively without unduly risking their lives or the mission. If they fail to do so, civilians often pay the price. In this paper, I argue that to the extent that non-combatants benefit from the attempt to fight justly, and (...) to the extent that wars in which combatants attempt to fight justly can be understood as a system of social cooperation which produces both burdens and benefits, non-combatants have a responsibility to shoulder their fair share of these burdens. Thus, if combatants (and by extension enemy non-combatants) are disproportionately burdened in a conflict, non-combatants ought to take on some costs, for instance in order to reduce the strain imposed on combatants by systemic factors such as the availability and distribution of resources. (shrink)

Online music sharing, deemed illegal for invading intellectual property rights under current laws, has become a crucial issue for the music industry in the modern digital age, but few have investigated the potential costs and utilities for individuals involved in such online misbehavior. This study aimed to fill in this gap to predict consumers' intentions to engage in online music sharing and further consider consumers' online music sharing knowledge as a moderator in the research model. The results (...) of repeated measures analysis of variance of costs and utilities of online music sharing not only give more detailed information to grasp empirical implications but also provide some suggestions to the music industry in Taiwan. (shrink)

Colemanand Shapiro have recently advanced a second at- tempt to reconcile Hart’s practice theory of rules and the idea of the normativity of law; i.e., the idea that legal rules qua social rules give reasons for actions and, in some circumstances create and impose duties and obligations. Their argumentative strategy is to resort to elements in Bratman’s work on shared agency and planning, though they introduce important and substantive modifications to Bratman’s own explanation. Bratman describes his own theory as a (...) modest theory of the will where the notion of planning plays a fundamental role. Both Shapiro’s and Coleman’s application of Bratman’s planning theory of agency to an authority structure such as law is impressive, but a number of objections can be levelled, with the intention of grasping both the nature of authority structures and the normativity of law. Although I have referred to Shapiro’s and Coleman’s applica- tions as being similar to one another, the differences are sub- stantive and important. I will scrutinise both Shapiro’s and Coleman’s explanations of ‘shared agency’ and discuss the objections that can be raised against each application. (shrink)

In this comment, I describe how the processes of free giving can be simulated with the help of the Reflexive Intentional Model of the Subject (RIMS). This simulation demonstrates that there are two essential factors affecting the size of a share given to others: limits accepted by the society as “normal,” and the individual's subjective estimation of a mean share donated by other members of the society.

The car-sharing system is a popular rental model for cars in shared use. It has become particularly attractive due to its flexibility; that is, the car can be rented and returned anywhere within one of the authorized parking slots. The main objective of this research work is to predict the car usage in parking stations and to investigate the factors that help to improve the prediction. Thus, new strategies can be designed to make more cars on the road and (...) fewer in the parking stations. To achieve that, various machine learning models, namely vector autoregression, support vector regression, eXtreme gradient boosting, k-nearest neighbors, and deep learning models specifically long short-time memory, gated recurrent unit, convolutional neural network, CNN-LSTM, and multilayer perceptron, were performed on different kinds of features. These features include the past usage levels, Chongqing’s environmental conditions, and temporal information. After comparing the obtained results using different metrics, we found that CNN-LSTM outperformed other methods to predict the future car usage. Meanwhile, the model using all the different feature categories results in the most precise prediction than any of the models using one feature category at a time. (shrink)

Purpose of the study is to determine factors influencing transaction costs on the sharing economy. The article examines the evolution of the fundamental concept of economic theory – transaction costs, under the influence of the expansion of sharing economy. The sharing economy appears to be the result of the further development of the consumption economy, since within the framework of this economic system, the quality of the services provided is improving. The scientific novelty lies in the clarification (...) of the mechanism of mutual development of both the sharing economy and transaction costs. As a result, the importance of the factor of massive use of the Internet and mobile devices by a huge number of people, as influencing the service provision market, was revealed. At the same time, there is no need to overcome various barriers, and entrepreneurs have the opportunity to sell not so much reductions in production costs, but rather a reduction in transaction costs. (shrink)

I agree with Gurven that costly signaling can explain food-sharing phenomena. However, costly signaling may also explain the role of food sharing in deterring rivals. Details of food-sharing interactions may reveal gains and losses in the social prestige of the interacting parties. The evolutionary models of kin selection and of reciprocal altruism are unstable and should be avoided.

Estimation and evaluation of individualized treatment rules have been studied extensively, but real-world treatment resource constraints have received limited attention in existing methods. We investigate a setting in which treatment is intervened upon based on covariates to optimize the mean counterfactual outcome under treatment cost constraints when the treatment cost is random. In a particularly interesting special case, an instrumental variable corresponding to encouragement to treatment is intervened upon with constraints on the proportion receiving treatment. For such settings, (...) we first develop a method to estimate optimal individualized treatment rules. We further construct an asymptotically efficient plug-in estimator of the corresponding average treatment effect relative to a given reference rule. (shrink)