Gender and the influence of peer alcohol consumption on adolescent sexual activity

I consider the alcohol consumption of opposite-gender peers as explanatory to adolescent sexual intercourse and demonstrate that female sexual activity is higher where there is higher alcohol consumption among male peers. This relationship is robust to school fixed effects, cannot be explained by broader cohort effects or general antisocial behaviors in male peer groups, and is distinctly different from any influence of the alcohol consumption of female peers which is shown to have no influence on female sexual activity. There is no evidence that male sexual activity responds to female peer alcohol consumption.     

CAN SCHOOL SPORTS REDUCE RACIAL GAPS IN TRUANCY AND ACHIEVEMENT?

While existing research supports that participation in high‐school athletics is associated with better education and labor‐market outcomes, the mechanisms through which these benefits accrue are not well established. Using individual microdata collected daily, and team‐specific schedules, we retrieve estimates of the causal effect of high‐school athletic participation on absenteeism, suggesting that participation decreases absences, driven primarily by reductions in unexcused absences in boys. There are also strong game‐day effects in truancy, in both boys and girls, with truancy declines on game days more than offset by subsequent absenteeism. Important heterogeneity by race, gender, and family structure may serve to substantially reduce racial gaps in truancy and achievement. (JEL I21, L83)     

A Strategy for Opening a New Market and Encroaching on the Lower End of the Existing Market

We identify and analyze a scenario where a firm first opens up what we call a “detached” market, by offering a new product that meets a customer need that is very different from (i.e., detached from) the need met by the old established product. Our analysis builds on the previous studies that describe alternate ways in which a new product might open a new market and ultimately encroach on an existing market. Consider the example of cell phones: They opened up a new detached market by meeting the customer need for mobility, a need very different from the traditional attribute of reception quality. By meeting an important detached need, a new product can sell at a high price, even though it might be woefully deficient with regard to the traditional performance dimension (the reception/coverage of early cell phones was sorely lacking). A person who is a high‐end customer for the old product initially despises the new product as a replacement for the old one but might simultaneously be one of the first customers for the new product because it fills the detached‐market need. Over time, the new product improves along the traditional dimension (e.g., cell phone reception/coverage has dramatically improved), and eventually it becomes a replacement for the old product, encroaching from the lower end upward (the first customers to drop their landlines have been lower‐end customers such as students and apartment dwellers, whereas higher‐end business customers still have landlines in their offices). We call this the detached‐market form of low‐end encroachment and show how it helps explain the conundrum of an expensive “disruptive” innovation. We go on to relate our results to the finding that “willingness to cannibalize” is a key factor in an incumbent firm's growth and survival, and to the “blue ocean strategy.”     

Family Influence on Physical Health During the Middle Years: The Case of Onset of Hypertension

Using survival analysis for 367 married women and 340 married men, this article investigates (a) change in hazard rates and survival probabilities with age for the onset of hypertension and (b) the influences of stressful marital and parental relationships on the hazard rates and survival probabilities of hypertension. Hazard and survival plots show that the risk for hypertension increases during the middle years to maximum, then decreases with age for both men and women. Log‐logistic survival models demonstrate that although marital stress significantly increases the likelihood of earlier hypertension among these long‐time married men and women, parental stress increases the likelihood of earlier hypertension only for women. These models control for the effects of stressful work conditions, health behaviors, hostility, and education. Employing a longitudinal research design strengthens confidence in the findings. The findings demonstrate that stressful close relationships may be more important determinants of physical health than is generally assumed.     

澳大利亚人的生态观——透过文学作品看澳大利亚人生态意识的演变(1788-2008)

文章通过分析早期以来至今澳大利亚具有代表性的作家的文学作品来审视从殖民时期到现在人们对"自然"或"土地"的态度的变迁:早期的移民怀着寻求"伊甸园"的理想来到澳大利亚这块土地上,结果却发现在这崭新而陌生的环境中,生存和"战胜自然"成了他们的当务之急,于是过度开发和利用自然资源使得生态环境遭到了严重破坏;后来,由于人们越来越多地认识到土著居民与自然之间的和谐关系,也由于各种环境运动蓬勃兴起,再加之近年来产生的文学理论——生态批评——将环保意识不断灌输给人们,于是,人们逐渐开始关注、热爱、保护并尊重这块"与众不同"的土地。本文提及的作家包括肯德尔、劳森、斯特德、凯瑟琳.苏珊娜.普理查德、朱迪斯.赖特及约翰.金塞拉,另外作者本人的部分诗歌也被引用。     

Lowest Cost May Not Lower Total Cost: Using “Spackling” to Smooth Mass‐Customized Production

Consider a manufacturer who mass customizes variants of a product in make‐to‐order fashion, and also produces standard variants as make‐to‐stock. A traditional manufacturing strategy would be to employ two separate manufacturing facilities: a flexible plant for mass‐customized items and an efficient plant for standard items. We contrast this traditional focus strategy with an alternative that better utilizes capacity by combining production of mass‐customized and standard items in one of two alternate spackling strategies: (1) a pure‐spackling strategy, where the manufacturer produces everything in a (single) flexible plant, first manufacturing custom products as demanded each period, and then filling in the production schedule with make‐to‐stock output of standard products; or (2) a layered‐spackling strategy, which uses an efficient plant to make a portion of its standard items and a separate flexible plant where it spackles. We identify the optimal production strategy considering the tradeoff between the cost premium for flexible (versus efficient) production capacity and the opportunity costs of idle capacity. Spackling amortizes fixed costs of capacity more effectively and thus can increase profits from mass customization vis‐à‐vis a focus strategy, even with higher cost production for the standard goods. We illustrate our framework with data from a messenger bag manufacturer.     

Family Contingencies Across the Generations: Grandparent‐Grandchild Relationships in Holistic Perspective

Family relationships do not occur in isolation but rather are embedded within greater systems of family ties. In recognition of the need to study families holistically, we explore how relations between grandparents and grandchildren are contingent upon a matrix of intergenerational relationships. Using data from the Iowa Youth and Families Project, our analyses focus on person‐centered types of grandparent‐grandchild relationships and the legacy of social ties across the generations, as mediated by other family relationships. We find multiple dimensions of grandparents' involvement with their grandchildren to be associated with (a) whether the grandparents knew their own grandparents when they were young, (b) the grandparent's perceptions of contact and closeness with the target grandchild, and (c) nuances in the relationships of grandparents with the parent generation.     

Public nudity on cell phones: Managing conflict in crisis situations

Analyzing news coverage to recount a fast-moving, dramatic marketing PR incident that occurred in South Korea, the contingency theory of conflict management and crisis management strategies are integrated to examine how crisis is communicated and managed in a very short period of time. Several types of strategies were utilized by contending parties through the various stages of the crisis life cycle. We found evidence for a new contingent variable that should be added in the matrix of contingent factors--the importance of Internet community and Netizens as organized and influential public. Netizens played an important role throughout the crisis period in changing the organization's stance from advocacy to accommodation.     

Parental Behavior and the Quality of Adolescent Friendships: A Social‐Contextual Perspective

On the basis of an evolving social‐contextual perspective, the authors predicted and found that socioeconomic advantage in terms of income and parental education promotes supportive and inhibits hostile parental behaviors toward an adolescent child (N= 221). These parental behaviors predicted similar actions by the child toward a close friend 4 years later. In turn adolescent supportiveness promoted close friendship ties, whereas hostility diminished the quality of friendships. The results support the notion that, to a significant degree, the quality of family interactions: (a) arises from the social context surrounding the family, (b) is transmitted across generations, and (c) has a demonstrable impact on the quality of adolescents' social ties outside the family.