Gifts given, gifts taken: The behavioral ecology of nonmarket, intragroup exchange

Behavioral ecologists combine evolutionary models of mechanism and ecological models of circumstance to analyze the origins and forms of intragroup exchange among social foragers, a category that includes primates, hominids, and recent and modern hunter-gatherers. Evolutionary mechanisms encompass individual, sexual, reciprocal, kin, group, and cultural selection; models of circumstance include tolerated theft, scrounging, marginal value, trade, show-offs, and risk reduction. After a critical review, I develop a partial synthesis of these models. The results show that exchange behaviors have multicausal origins and they likely will be diverse due to differing combinations of mechanism and circumstance. They also help explain seemingly unique features of foraging economies, including constrained production and routine demand sharing.     

PRICE UNCERTAINTY,FACTOR SUBSTITUTION,AND THE LOCATIONAL BIAS OF BUSINESS TAXES*

Consideration of the integrated production-location problem is extended to include several types of business taxes. Many of these taxes are technologically and spatially neutral under certainty, but are shown to be nonneutral when factor prices are stochastic and the firm is risk averse, even when the tax is spatially uniform. Consequently, even a nationally uniform tax can have regional biases and can encourage migration of plants. When factor prices are uncertain, the effects of taxes on output rates, input ratios, and plant location vary with the form of the tax imposed as well as the amount to be paid. Income taxes involve the taxing authority in sharing the risk with the firm and are shown to promote risk taking by the firm and induce the expansion of output. Locational incentives which are mutually beneficial to firms and the government are presented.     

Procedural and Substantive Fairness in Risk Decisions: Comparative Risk Assessment Procedures1

The issue of fairness often is central within environmental policy debates. The recent proliferation of state and local comparative risk projects for informing the selection of environmental policy priorities offers an appropriate setting to explore the issue of procedural fairness in risk-based decisionmaking. This paper describes and evaluates the process by which one of the initial state comparative risk projects, Washington's “Environment 2010,” attempted to include a broader range of participants in identifying, assessing, and generating preferred management strategies for a wide range of environmental hazards. The Washington case study suggests that comparative risk projects can be fairer procedurally, but that significant barriers remain. Noting that greater procedural fairness does not necessarily produce greater substantive fairness, the paper concludes that more attention needs to be directed at the process by which comparative risk projects translate their consensus upon risk priorities into subsequent actions.     

Operationalizing social equity in public policy design: A comparative analysis of solar equity policies in the United States

While it is widely recognized that energy injustices are prevalent in the clean energy transition process, there has been limited research attention on policy efforts aiming to mitigate these inequities. In this paper, we use solar equity policies as an empirical case study to understand how social equity considerations are conceptualized and operationalized in energy policy content. We build upon the policy design literature and code institutional statements of 54 solar equity policies adopted between 2001 and 2021 in the United States. In our comparative analysis, we focus on three levels of policy design elements that can be directly observed in written policy language: macro-policy goal construction, meso-policy instrument choices, and micro-level policy settings and calibrations. We find that the policy goal of energy justice is multifaceted, with a great emphasis on solar energy accessibility and provision of economic benefits and security for disadvantaged communities. There is a dominant preference by policymakers to use redistributive policies and community solar programs to advance energy justice-related goals. Solar equity policy instruments on-the-ground measures have also been calibrated to target specific disadvantaged populations in the energy system, which focus mostly on income-based vulnerability.     

可控激光束焊接薄壁青铜器工艺实验

采用大功率二氧化碳激光器 (5kW)和大型数控激光加工工作台 (2 0 0 0mm× 1 2 50mm) ,对采用传统青铜器铸造方法制备的不同成分、不同厚度的青铜试样进行激光焊接工艺试验 ,并对焊接部位的组织、结构进行微观测试分析和机械性能测试。初步确定激光焊接一定厚度青铜器所需最佳工艺参数组合 ,用此最佳工艺参数对几件典型的青铜器文物进行了修复。研究项目对提高我国文物修复技术水平 ,具有重要意义。     

Sociobiology and human nature

Abstract

One of the main theses of sociobiology is that between human beings and the so called 'social' animals there are no qualitative differences, and it is for this reason that it is possible to identify in human beings and social animals essentially similar behaviours, all of which are genetically determined. Sociobiologists often take this idea as a basis for the belief that there exists in the universe an ontological unity that can be understood by means of the scientific empirical method. In this sense, sociobiologists attempt to build a model of human nature in which the fundamental goal of all human action is biological survival, to be understood in terms of the preservation and transmission of genes. In this paper I present a critical approach to these sociobiological theses. Employing a dialectical method, I start from the idea that human beings are qualitatively different from the social animals. Without denying their biological foundations, I affirm that human behavioural characteristics should be understood as products of historical–cultural relations. Even phenomena considered to be the most basic and essential for biological survival, for example diet, rest, and sexuality, possess a fundamental cultural character in which biological survival does not necessarily play an important role. The same can be said of human attitudes towards death and pain. Sociobiology underestimates this historical–cultural dimension of human existence and, despite being a discipline grounded in the theory of evolution, it takes for granted a series of essential principles as unchangeable realities. In this way sociobiology produces an ideological discourse on human nature, a false representation of the world which can be of great utility for legitimising many oppressive and discriminatory practices.     

Logistical mobility reduces subsistence risk in hunting economies

Increasing carnivory is frequently cited as one of the key trajectories in the course of hominin evolution, yet the ethnographic record demonstrates that hunting is a high-variance, risky strategy necessitating a fundamental re-organisation of the foraging pattern. Hunter-gatherers rely on intra-band sharing of hunted resources as well as inter-band insurance mechanisms to mitigate against the risk of resource failure. It is suggested that logistical mobility functions to increase encounter rates with both prey and representatives of neighbouring groups, and is thus a fundamental part of the hunting adaptation. Implementation of an ideal gas model of encounter rate demonstrates that, when logistical mobility is regarded as a basic group fission pattern, it increases encounter rates for all groups relying on greater than 34% hunting. This equates to a shift in the optimal hunting percentage, as defined by encounter rates, from 24% under residential mobility to 35% under a logistical mobility strategy. These results are discussed in relation to fission–fusion social systems in primates and social carnivores, with a view to highlighting the specific aspects in which these differ from human foraging strategies.     

Variability in Faunal Assemblages: The Influence of Hunting Skill, Sharing, Dogs, and Mode of Cooking on Faunal Remains at a Sedentary Kalahari Community

Variability in faunal assemblages from different sites and/or from different time periods is often attributed to economic or taphonomic factors. The role of sharing on faunal remain distributions is compared to other factors that have been suggested to influence these distributions, such as hunting skill. Faunal species and skeletal elements are compared among three hunter—gatherer camps that form a sharing network. These are contrasted with those of two other hunter—gatherer camps located at the same Kalahari community occupied by an unusual family that is a relative isolate in terms of sharing. The effect of sharing on equalizing variation in hunting success as reflected in the faunal remain inventory is explored from the five camps inventoried in 1990. Complicating factors which tend to affect faunal remain frequencies are also examined, such as cooking technique and dogs. All faunal remains visible on the surface of each camp were recorded according to species, element or fragment portion, age (mature or immature), and, when possible, side. At all but one camp, surface faunal remains were recorded both before and after ethnographic observations during the dry season of 1990. In addition to hunting success, all occurrences of sharing and consumption of meat were recorded during these observation periods and those conducted on and off between 1987 and 1992. Although participation in a sharing network obscures differences in hunting skill in the archaeological record, sharing impacts on faunal assemblages in interesting ways that are potentially archaeologically visible. Sharing in strongly egalitarian societies levels unequal hunting skill that could otherwise affect faunal remain frequencies, taxa richness, meat weight, and other indices measured here. In these societies, sharing reinforces social bonding between kin and friends in ways that help unit families from different camps.Zooarchaeologists have become accustomed to high levels of confidence in their inferences about the origins, functions, and responses to stress of animal remains. This confidence rests on the causal and functional links between attributes of these remains and the processes and contexts which generate them. Their investigations are presently moving toward wider inferences about the context and functions of bones in ancient hominids' behavioral systems… Zooarchaeologists now need a different set of inferential strategies than that which characterized their preceding phase of research. (Gifford 1991:215)     

Seasonal fluctuations in diet and death during the late horizon: a stable isotopic analysis of hair and nail from the central coast of Peru

The goal of the isotopic analysis of hair and nail from Puruchuco-Huaquerones is to reconstruct short term paleodiet using the stable isotopes of carbon and nitrogen in one centimetre increments of hair and two discrete points (distal and proximal) on the nail. This sampling method allows for the reconstruction of diet on a monthly basis (hair) and also diet at two periods (nail): four months and two weeks antemortem. The analysis of these two tissues demonstrates that diet varied from month to month and that food was not stored in any significant quantity. The patterning of the isotope data appears to be closely tied to the agricultural cycle, although a vertical economy cannot be rejected as an alternative explanation. Isotope data for both short (e.g., hair and nail) and long term diet (e.g., bone) are similar; this is interpreted as evidence for the continuity of the settlement in this area. There are no significant differences in the season of death between males or females or between the winter and summer months. The slightly higher mortality rate in the summer may be due to crop failure and subsequent food shortages.     

Carnivory, Coevolution, and the Geographic Spread of the Genus Homo

This review traces the colonization of Eurasia by hominids some 1,700,000 years ago and their subsequent evolution there to 10,000 years ago from a carnivorous perspective. Three zooarchaeological trends reflect important shifts in hominid adaptations over this great time span: (1) increasing predation on large, hoofed animals that culminated in prime-adult–biased hunting, a predator–prey relationship that distinguishes humans from all other large predators and is a product of coevolution with them; (2) greater diet breadth and range of foraging substrates exploited in response to increasing human population densities, as revealed by small-game use; and (3) increased efficiency in food capture, processing, and energy retention through technology, and the eventual expansion of technology into social (symbolic) realms of behavior. Niche boundary shifts, examined here in eight dimensions, tend to cluster at 500 thousand years ago (KYA), at 250 KYA, and several in rapid succession between 50 and 10 KYA. Most of these shifts appear to be consequences of competitive interaction, because high-quality, protein-rich resources were involved. Many of the boundary shifts precede major radiations in the equipment devoted to animal exploitation. With a decline in trophic level after 45 KYA, demographic increase irreversibly altered the conditions of natural selection on human societies, from a largely interspecific competitive forum to one increasingly defined by intraspecific pressures. Regionalization of Upper Paleolithic artifact styles is among the many symptoms of this process.     

Health Financing Systems,Health Equity and Universal Health Coverage in Arab Countries

This article provides an overview of health financing structures in Arab countries in the context of their preparedness for universal health coverage. Current arrangements have left large swathes of the population shouldering high financial burdens and facing hardships when using healthcare, with significant impoverishing and deterrent effects. Health protection schemes are most comprehensive for those who can afford healthcare; they are mainly based on contributions and formal employment and thus fail to cater for the poor and the rural and informal sectors. Financing systems also lack the operational bases and institutional prerequisites for effective resource pooling and risk sharing, with segmentation and fragmentation worsening horizontal and vertical inequities. The neglect of public health systems has reinforced inequities by widening the gap between needs and provision, and by emphasizing the ability to pay as a basis for accessing quality care. In a context of informality and poverty, focusing reforms on health insurance is not a panacea. Rather, moving towards universal health coverage and reducing health inequities will require changes in the level of political tolerance for social injustice, and a paradigm shift to a more equity‐based political economy which views health as an investment and an entitlement.     

Carbon Isotope Variability in the Bone Collagen of Red Kangaroos (Macropus rufus) is Age Dependent: Implications for Palaeodietary Studies

Isotopic assessment of bone collagen is often used as an environmental tracer in both contemporary and palaeoenvironmental studies. However, variability in the isotopic composition of this tissue remains poorly understood for naturally occurring and wild populations of animals. In this study the stable carbon isotope composition of both diet and bone collagen was assessed for a population of red kangaroos (Macropus rufus). Animals sampled ranged in age from approximately 10 months to 15 years. The diet of this population, estimated from faeces collected in the field, varied from predominantly C₄grasses in late summer (δ¹³C⋍−16·5‰) to mostly C₃herbage in late winter (δ¹³C⋍−22·5‰), with a long-term average δ¹³C of between −19 and −20‰. Bone collagen was enriched in¹³C by 3 to 4‰ in older animals relative to pouch young. Isotopic analysis of hair, used to assess more recent diet in individuals, indicated that diet selection was similar in all animals that had been weaned. We suggest that the most likely explanation for the age-dependent relationship in the δ¹³C of bone collagen occurs because milk (the only source of nutrition in suckling kangaroos) is not fractionated in the same manner as plant-derived carbon during its assimilation into skeletal tissue. If this is the case, then such a relationship should be most predominant in mammals that have low birth weights (relative to the adult mother) and gain significant weight from milk. Whatever the precise mechanism(s) for the observed fractionation, bone collagen of kangaroos seems to retain an isotopic memory of the carbon laid down prior to weaning, which takes several years to be diluted and replaced with carbon derived from an “adult” herbaceous diet. These results have implications for palaeoecological research where fossil skeletal tissue is used as dietary or environmental tracers particularly if the relative age of the animals sampled is unknown.     

The Zone Definition Problem in Location-Allocation Modeling

Location-allocation modeling is a frequently used set of techniques for solving a variety of locational problems, some of which can be politically sensitive. The typical application of a location-allocation model involves locating facilities by selecting a set of sites from a larger set of candidate sites, with the selection procedure being a function of “optimality” in terms of the allocation of demand to the selected sites. In this paper we examine the sensitivity of one particular type of location-allocation model, the p-median procedure, to the definition of spatial units for which demand is measured. We show that a p-median solution is optimal only for a particular definition of spatial units and that variations in the definition of spatial units can cause large deviations in optimal facility locations. The broad implication of these findings is that the outcome of any location-allocation procedure using aggregate data should not be relied upon for planning purposes. This has important implications for a large variety of applications.     

In the Shade of the Oaks of Mamre: Hospitality as a Framework for Political Engagement between Christians and Muslims

Abstract

This essay is the initial sketch of a theological framework for political dialogue based on traditions of hospitality. This essay is intended to further a normative commitment to pluralism by creating a space for Christians and Muslims to engage in political dialogue on issues of governance. Using the story of Abraham and the three strangers, the essay analyzes hospitality as a possible model for interreligious political dialogue. The essay follows the narrative of the story recounted in Genesis 18 and Surah 51 of the Qur'an focusing on Abraham's greeting of the strangers as expressing a "duty of hospitality"; the "sharing of a meal" as an act of mutual vulnerability; and the gift of Isaac as exemplary of hospitality's possibility for grace and transformation. The goal is to show that a shared theological tradition could be the basis for political dialogue.     

Liberty,Equality, Nobility: Kolnai,Tocqueville, and the Moral Foundations of Democracy

Abstract

Though few would attach the label of liberal to Dostoevsky as a thinker his life and work can be seen as motivated by a concern for human freedom. As an editor and author he advocated a course of action for his nation's intelligentsia that would transform the Russian autocracy into a liberal regime. This course of action was dictated by his insight into the necessary foundation for a liberal regime, a principle of self-abnegation that rested in turn on the conviction that human beings share in an immortal principle. This insight points to and gives content to the true goal of the liberal regime, the recognition and protection of human dignity.     

Reconstructing dietary and environmental history from enamel isotopic analysis: time resolution of intra‐tooth sequential sampling

The carbon and oxygen isotopic composition of the mineral phase of tooth enamel is linked to diet and environment. Enamel is not remodelled once formed. Several studies of intra‐tooth isotopic variability in hypsodont mammal teeth have involved sequential sampling of enamel in order to detect changes in diet and environment during tooth formation. The possibility of exploring individual history opens the door to many applications, particularly in palaeoenvironment and herd management reconstruction. However, previous histological investigations have shown that enamel mineralization is a progressive and discontinuous process. The goal of the present study is to determine if this pattern significantly influences the time resolution of an intra‐tooth sequential sampling. Isotopic analyses (δ¹³C) were performed on tooth enamel from steers (Bos taurus) that had changed from a C₃ plant‐based diet to a C₄ plant‐based diet with very different carbon isotopic compositions. The change of diet was reflected in the mineral phase of enamel. The pattern of intra‐tooth isotopic variation suggests that completion of enamel mineralization required six to seven months. Such a lag in enamel mineralization will decrease the time resolution of enamel sequential sampling. The effects of prolonged mineralization of enamel have to be considered when interpreting patterns of intra‐tooth isotopic variations. Copyright © 2002 John Wiley & Sons, Ltd.     

OPTIMAL REGIONAL GROWTH MODELS: MULTIPLE OBJECTIVES, SINGULAR CONTROLS, AND SUFFICIENCY CONDITIONS

ABSTRACT We develop a generalized Harrod-Domar type of model for optimal regional growth which allows determination of the optimal allocation of regional public investments and which considers multiple growth objectives, as well as both normal and singular fiscal instruments. This general model is shown to include most of the previous optimal regional growth models as special cases. Necessary conditions for some special cases of the general model are analyzed in detail, and decision rules associated with derived optimal regional growth policies are articulated. These special cases verify that singular controls do exist in certain instances, and that they must be considered for the complete specification of optimal regional growth policies; this is significant because singular controls have not been previously analyzed in the literature. We conclude the paper with a discussion of sufficiency conditions for optimal regional growth models which is more general than that given by previous authors.     

An Evolutionary Algorithm for Site Search Problems

The goal of solving a site search problem is to allocate a contiguous set of land parcels such that the total land acquisition cost, or other objectives, are optimized. This article describes the design and implementation of an evolutionary algorithm (EA) that can be used to solve site search problems. In this article, a graph representation is used to define the spatial structure of solutions to the problem. By using this representation, the contiguity of a site is maintained during the initialization, mutation, and local search operations of the EA. The effectiveness of the EA in finding optimal or near-optimal solutions is demonstrated by testing it on a series of problems whose optimal solutions are known.     

Beyond the ration: sharing and scrounging on the western front

The assumption to date has been that military provisioning was an unmitigated success for the British Army of the First World War; a judgement not reflected in the accounts of many of the rank and file soldiers on the Western Front. The men were often disappointed not merely by shortfalls, but also by rations that, though high in calories, failed to tempt the palate or reflect the civilian meals that had shaped their eating preferences. Whether driven by hunger or boredom, supplementing the official diet was a regular occupation for the men, through parcels from home, visits to the canteens or less legitimate means. Scrounging opportunities ranged from apples scrumped in a French orchard and an opportunistic raid on a chicken coop, to the pilfering of army stores. This article demonstrates the extent of the role played by this extra food in the men's diet and explores the significance of the way in which it was obtained and consumed. Whatever the source of the food, its even-handed division was a subject repeatedly referenced in the soldiers' diaries, letters, and memoirs. The sharing of food between pals in a just and proper fashion re-created, to some small degree, a microcosm of an ordered, civilized world in the ranks.