We attempt to identify and evaluate the association between key characteristics of not-for-profit hospitals and market concentration, as measured by the Herfindahl–Hirschman Index, using data available from the American Hospital Association, the Centers for Medicare and Medicaid Services, and the Internal Revenue Service Form 990. Our goal is to provide decision support to policy makers on factors that contribute to market competitiveness, which has been linked to improvements in efficiency, costs, and access to health care. We find that contributions are (...) positively associated with market concentration. This could indicate that well-run NP hospitals are rewarded both financially as well as with increased market share. We also find that a higher percentage of Medicare patients is positively correlated with market concentration. This could be explained by the fact that Medicare reimbursement rates are generally lower than those paid by private insurers ; thus, hospitals might not necessarily choose to operate in areas with high Medicare populations. Further, median income is negatively associated with market concentration. One explanation for this effect could be the fact that a population with a higher median income is in a better position to pay for services, making them attractive to hospitals as a potential market. Finally, we find that the presence of managers with voting rights on the boards of directors has no significant impact. (shrink)

Resumen: Este artículo tiene como objetivo ofrecer al lector un análisis de las figuras antropomorfas conocidas como dogū, que fueron elaboradas durante el período Jōmon de la prehistoria japonesa. Para ello, en primer lugar, será necesario esclarecer sus orígenes y evolución a partir del conocimiento arqueológico acumulado hasta la actualidad, que pondrá de relieve un proceso gradual de complejización tipológica, desde formas primarías hasta un intento de trascender la representación del cuerpo humano. Al mismo tiempo, también se deberá prestar atención (...) a su diversidad sincrónica, marcada por diferentes tipos con una mayor o menor presencia en el marco espacial del archipiélago. Esta labor permitirá no sólo delimitar las diferentes etapas protagonizadas por estas figuras, sino también esclarecer su posible significado y uso. Ello nos conducirá finalmente a un replanteamiento sobre la propia existencia de los dogū como categoría arqueológica. (shrink)

Whether man is predisposed to lethal violence, ranging from homicide to warfare, and how that may have impacted human evolution, are among the most controversial topics of debate on human evolution. Although recent studies on the evolution of warfare have been based on various archaeological and ethnographic data, they have reported mixed results: it is unclear whether or not warfare among prehistoric hunter – gatherers was common enough to be a component of human nature and a selective pressure for the (...) evolution of human behaviour. This paper reports the mortality attributable to violence, and the spatio-temporal pattern of violence thus shown among ancient hunter–gatherers using skeletal evidence in prehistoric Japan (the Jomon period: 13000 cal BC–800 cal BC). Our results suggest that the mortality due to violence was low and spatio-temporally highly restricted in the Jomon period, which implies that violence including warfare in prehistoric Japan was not common. (shrink)

Este trabajo analiza el papel de los suidos en la ritualidad protohistórica japonesa, tomando como base la aparición de una serie de restos óseos de estos animales en contextos rituales y/o con indicios de consumo ritual, especialmente en los periodos Jōmon (ca. 10,500-300 a.n.e.) y Yayoi (1,000-900 a.n.e.-250-300 d.n.e.),. Pero antes de entrar de lleno en la problemática de estos ejemplares, es necesario realizar una retrospectiva del papel de dichos animales en el archipiélago japonés desde la Prehistoria, así como de (...) la propia domesticación del cerdo en el continente asiático y su difusión por Asia Oriental hasta llegar a las islas japonesas. A este respecto, hay que tener en cuenta que existen tres ámbitos de estudio diferenciado en lo referente a los suidos en el archipiélago japonés: Hokkaidō, el archipiélago de las Ryūkyū y las islas de Kyūshū Honshū y Shikoku. (shrink)

The evolution of altruism in human societies has been intensively investigated in social and natural sciences. A widely acknowledged recent idea is the “parochial altruism model,” which suggests that inter- group hostility and intragroup altruism can coevolve through lethal intergroup conflicts. The current article critically examines this idea by reviewing research relevant to intergroup conflicts in human evolutionary history from evolutionary biology, psychology, cultural anthropology, and archaeology. After a brief intro- duction, section 2 illustrates the mathematical model of parochial altruism (...) and some critiques of the model and its interpretation, primarily from an evolutionary biology point of view. Section 3 delves into the archaeological evidence of prehistoric intergroup conflicts in the Japanese archipelago’s Jomon and Yayoi periods, Europe’s Mesolithic period, and North America’s Pacific period as counter examples of the paro- chial altruism model. In section 4, the ethnographies of intergroup relationships and conflicts reveal that intergroup relationships in many ethnic groups are not as simple as the assumption in the mathematical model of parochial altruism. In section 5, we outline psychological research on intergroup conflicts which suggest that intergroup hostility and ingroup altruism are not necessarily correlated. In conclusion, we argue that the assumption and parameter settings of the parochial altruism model are inconsistent with empirical data. (shrink)

The present study collected a larger set of three-dimensional data on human crania from the Kofun period (as well as from previous periods, i.e., the Jomon and Yayoi periods) in the Japanese archipelago (AD 250 to around 700) than previous studies. Three-dimensional geometric morphometrics were employed to investigate human migration patterns in finer-grained phases. These results are consistent with those of previous studies, although some new patterns were discovered. These patterns were interpreted in terms of demic diffusion, archaeological findings, (...) and historical evidence. In particular, the present results suggest the presence of a gradual geological cline throughout the Kofun period, although the middle period did not display such a cline. This discrepancy might reflect social changes in the middle Kofun period, such as the construction of keyhole-shaped mounds in the peripheral regions. The present study implies that a broader investigation with a larger sample of human crania is essential to elucidating macro-level cultural evolutionary processes. (shrink)

The present study examines the 3-dimensional data of human crania from the Yayoi period (800 BC to AD 250) of the Japanese archipelago by geometric morphometrics to investigate demic diffusion patterns. This is the first study on the Yayoi crania using their 3D data and geometric morphometrics with a much larger number of skeletal remains outside of the Kyushu regions than previous studies. The comparative results between the Jōmon and Yayoi samples show that the Yayoi people not only in the (...) eastern parts but also in the western parts of the archipelago are significantly different from the final Jōmon people and the Yayoi people were not strongly affected by the Jōmon people. A relatively gradual geological cline is also found among the Yayoi population, suggesting that the immigrants from the continental East Asia moved from the western parts to the eastern parts of the archipelago though the causes of the morphological changes are unclear. (shrink)

Violence and warfare in prehistory have been intensely discussed in various disciplines recently. Especially, some controversies are found on whether prehistoric hunter-gatherers had been already engaged in inter-group violence and warfare. Japanese archaeology has traditionally argued that warfare has begun in the Yayoi period with an introduction of full-fledged agriculture though people in the Jomon period, when subsistence system had been mainly hunting and gathering, had not been involved in inter-group violence and warfare. However, Lawrence Keeley, Samuel Bowles, Steven (...) Pinker, and others have recently focused on archaeological data of human skeletal remains, especially remains with some injures, arguing that prehistoric hunter-gatherers had already initiated inter-group violence and warfare. This paper aims to summarize and examine recent arguments that address the relationship between violence or warfare and human evolution based on archaeological data. In the first place, we summarize the claims of Keeley, Bowles, and Pinker that warfare had already been initiated and was commonplace among prehistoric hunter-gatherers, as well as the counter-argument of Ferguson that these original data are problematic. Secondly, we summarize the available data on human skeletal remains from the Mesolithic period in Europe (between 11,000 BC and 3,500 BC) and argue that these data support Ferguson’s argument. In particular, the available data suggests that even though inter-group violence and warfare was present during this period, it was very sporadic. Finally, we discuss the implications of this study and suggest future directions. (shrink)