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Michihiro C. Sugata 《Sociology Compass》2019,13(7)
The passage of the Dodd‐Frank Act in 2010 ushered in the most ambitious financial reforms since the Banking Act of 1933. The core of the Act centered on ensuring more consumer protections from predatory financial practices through the creation of the Consumer Financial Protection Bureau (CFPB), which provided federal oversight of fringe lenders that profited off of high‐interest loans such as payday and automobile title loans. Yet the current deregulatory environment being promoted by the Trump administration is once again loosening the reins on fringe lenders that provide quick access to cash at triple digit interest rates. In this article, I provide an overview of the alternative finance service industry with a specific focus on one such instrument: auto title loans. Drawing upon governmental reports and the literature, I provide a comprehensive overview of the how the industry functions and who it targets. By focusing on the profit model that undergirds the title loan industry, I show how the profitability of the industry is directly tied to the extended vulnerability of its customer base. I conclude by offering suggestions for researchers to rethink predatory lending practices as a form of financial violence in order to reframe the discourse surrounding predatory lending. 相似文献
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Practical approaches for design and analysis of clinical trials of infertility treatments: crossover designs and the Mantel–Haenszel method are recommended 下载免费PDF全文
Crossover designs have some advantages over standard clinical trial designs and they are often used in trials evaluating the efficacy of treatments for infertility. However, clinical trials of infertility treatments violate a fundamental condition of crossover designs, because women who become pregnant in the first treatment period are not treated in the second period. In previous research, to deal with this problem, some new designs, such as re‐randomization designs, and analysis methods including the logistic mixture model and the beta‐binomial mixture model were proposed. Although the performance of these designs and methods has previously been evaluated in large‐scale clinical trials with sample sizes of more than 1000 per group, the actual sample sizes of infertility treatment trials are usually around 100 per group. The most appropriate design and analysis for these moderate‐scale clinical trials are currently unclear. In this study, we conducted simulation studies to determine the appropriate design and analysis method of moderate‐scale clinical trials for irreversible endpoints by evaluating the statistical power and bias in the treatment effect estimates. The Mantel–Haenszel method had similar power and bias to the logistic mixture model. The crossover designs had the highest power and the smallest bias. We recommend using a combination of the crossover design and the Mantel–Haenszel method for two‐period, two‐treatment clinical trials with irreversible endpoints. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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The lifetime mating frequency of female butterflies is believed tobe dependent on the reproductive status of the males which
they have mated. This report assesses those status usingPieris rapae L. Multiple mating females mated males with a short time interval after the last mating or males with many mating records.
Such males, like small ones, produced small spermatophores during copulation, which may have resulted in high mating frequency
of those females. The males with short time interval after the last mating or those with many mating records also showed a
long mating duration. Alternative interpretations of the adaptive significance of this behavior for males are discussed. 相似文献
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Michihiro Kandori 《Econometrica : journal of the Econometric Society》2011,79(3):877-892
Repeated games with imperfect private monitoring have a wide range of applications, but a complete characterization of all equilibria in this class of games has yet to be obtained. The existing literature has identified a relatively tractable subset of equilibria. The present paper introduces the notion of weakly belief‐free equilibria for repeated games with imperfect private monitoring. This is a tractable class which subsumes, as a special case, a major part of the existing literature (the belief‐free equilibria). It is shown that this class can outperform the equilibria identified by the previous work. 相似文献
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Yasuyuki Ishibashi Takashi Saitoh Syuiti Abe Michihiro C. Yoshida 《Researches on Population Ecology》1998,40(1):51-59
Kinship amongClethrionomys rufocanus was investigated during the winter of 1992/93 in a 3-ha enclosure using both molecular and catch-mark-release techniques.
Forty-six adult voles (22 males and 24 females) having high heterozygosities, which were collected from several natural populations,
were released into the enclosure on 29 September 1992. Most fall-born individuals of both sexes stayed in their natal site
during the non-breeding period (December–March), although reproductively active females dispersed during the fall breeding
season (October–November). These philopatric individuals aggregated and formed an maternal family in the winter. Several females
which failed to reproduce were solitary during this season. Some individuals which were derived from several families also
aggregated into a mixed lineage group. Survival rate of fall-born voles from earlier litters was higher than that from later
ones. Maternal families broke up soon after the onset of spring reproduction. Most females established a territory near the
wintering site and made a kincluster, in which close relatives neighbored each other. Maternal families in winter bring about
female kin-clusters in spring, which may influence reproductive output in the breeding season. 相似文献
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Summary The present study investigated the way a wild bruchid,Kytorhinus sharpianus, distributes its eggs on host pods. First, we counted the number of eggs per pod on the host plant (Sophola flavescens) in the field. The egg-distributions by the overwintered-generation adults in July and by the second-generation adults in
mid October did not deviate from Poisson distribution because of small numbers of eggs laid. However, the egg-distribution
in late August when many first-generation adults emerged was significantly contagious.
The deposition of eggs was determined for three types of pods: (A) clean pods, (B) pods with eggs, and (C) those which eggs
had been laid on but were removed from later. The numbers of eggs laid newly on three types of pods were significantly different;
A>C>B, suggesting that an oviposition marker pheromone (O.M.P.) caused females to avoid pods on which eggs were deposited.
Egg-shells reinforced that response.
Monte Carlo simulations for the egg-distribution on pods predicted that even if females avoid pods with heavy egg-load through
O.M.P., the egg-distribution becomes contagious when there is a large heterogeneity in quality of the pods. 相似文献
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Michihiro Kandori Ichiro Obara 《Econometrica : journal of the Econometric Society》2006,74(2):499-519
Most theoretical or applied research on repeated games with imperfect monitoring has focused on public strategies: strategies that depend solely on the history of publicly observable signals. This paper sheds light on the role of private strategies: strategies that depend not only on public signals, but also on players' own actions in the past. Our main finding is that players can sometimes make better use of information by using private strategies and that efficiency in repeated games can be improved. Our equilibrium private strategy for repeated prisoners' dilemma games consists of two states and has the property that each player's optimal strategy is independent of the other player's state. 相似文献
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This study examines the role of learning and memory in the butterflyPieris rapae crucivora Boisduval during foraging for flowers. In an outdoor cage with 6 flower species,P. rapae showed various visiting patterns: some visited only one species, while others visited several species in a day. The foraging
process for flowers ofErigeron annuus (L.) Pers. could be divided into two successive steps: (1) landing on the nectaring caputs, and (2) finding the source of
nectar in the caput. Butterflies learned to proceed through the two steps more efficiently with successive attempts: they
gradually decreased landings on nectarless caputs and probings on the nectarless petals of ligulate flowers respectively.
As a result, handling time per unit caputs became shorter, and apparent rewards per unit time, i.e. the efficiency of collecting
nectar, increased. In addition, once learned,P. rapae could remember a rewarding flower color for 3 days, which was not interfered with by learning another flower color. This
indicates thatP. rapae keeps memory for a period longer than 3 days, and that they can remember at least two flower species as suitable flower resources.
Furthermore, data indicated that they sometimes can apply the foraging skills obtained on other flower species to a novel
one. These abilities could enable butterflies to easily switch flower species, or to enhance labile preference. It has been
known thatP. rapae also shows flower constancy, which may be due to memory constraints. Therefore, they may appropriately use two foraging tactics:
visit consistency and labile preference, to get enough nectar according to their circumstances. 相似文献
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