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251.
People frequently face uncertain income and the threat of loss can inhibit economic investments. Government redistribution can insure citizens against economic losses, but its effect on people’s investment decisions depends on how they react to redistributive rules. We apply methods from experimental economics to study how a redistributive institution affects people’s investment decisions. Experiment 1 tests whether redistribution can increase economic efficiency when people face risk problems—investment opportunities that are profitable on average but could result in a loss. In a between-subject design, participants decide whether to make a risky investment either individually or under an institution that redistributes earnings equally among four group members. We find greater investment and profits when participants are required to share their earnings. In Experiment 2, we examine free-riding by comparing an institution that allows non-investors to exploit investors to an assortment institution that matches investors with investors. We find that vulnerability to free-riding suppresses investment, whereas an assortment mechanism increases investment by preventing free-riding and thereby facilitating risk pooling.  相似文献   
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Despite substantial increases in the prevalence of adolescent overweight and obesity documented in recent decades, few studies have prospectively tracked their development during the entire adolescent period. The aims of this study were to characterize developmental trends in prevalence, incidence, and remission of overweight and obesity using annual data collected from ages 12 to 19 for 496 adolescent females. Ethnic differences between African American (n = 37), Latina (n = 96), and European American (n = 348) adolescents were also compared. The prevalence of overweight decreased slightly across adolescence and remission rates exceeded incidence (onset). Obesity was more chronic, with increasing incidence accompanied by decreasing remission rates. Middle through late adolescence was the period of greatest risk for the transition from overweight to obesity. African American and Latina females had higher overweight and obesity prevalence than European American females throughout adolescence. Differences in prevalence were driven by higher onset rates for African American and Latina females, whereas remission rates were comparable across ethnic groups. Results suggest that adolescence is not a high-risk period for onset of obesity for European American adolescent females, but is for African American and Latina adolescent females.  相似文献   
255.
This paper examines links between the Soviet transport sector and other sectors of the economy. In the 1970s, the transport sector was perceived as a bottleneck. As growth slowed in the late 70s, howevar, the transport sector was able to meet the economy's demands. At present, the transportation of oil and gas is placing an increasing burden on the transport sector, but pipelines can absorb the demands, freeing up rail transport capacity for other commodities. The willingness of Soviet officials to make the appropriate administrative reforms, apply new technologies and increase investment in this sector will determine transport's ability to meet future demands. Journal of Economic Literature, Classification Numbers: 052, 124, 731.  相似文献   
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Scientific, institutional and personal rivalries between three key centres of geographical research and scholarship (the Academy of Sciences Institute of Geography and the Faculties of Geography at Moscow and Leningrad State Universities) are surveyed for the period from 1945 to the early 1950s. It is argued that the debates and rivalries between members of the three institutions appear to have been motivated by a variety of scientific, ideological, institutional and personal factors, but that genuine scientific disagreements were at least as important as political and ideological factors in influencing the course of the debates and in determining their final outcome.  相似文献   
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This article is an examination of the attitudes of the British political elite towards the Soviet Union and an assessment of the influence such attitudes had upon British foreign policy between March and August 1939. Through a detailed analysis of individuals including Cabinet ministers and those politicians elsewhere referred to as the 'anti-appeasers', the article contributes to the 'counterrevisionist' position concerning war origins. Thus it does not accept that the British government was constrained by factors outside of its control and instead argues that an Anglo-French-Soviet alliance was not concluded because of the failure of British ministers to put aside their anti-Soviet prejudices.  相似文献   
260.
This study argued that while sanctions deter offenders from being involved in future drinking-driving offenses, alcohol addiction prevents individuals from making rational choices, and, thus, increases offenders' chances of being involved in drinking driving regardless of the certain, severe, and swift punishments they had experienced. Results indicated that, individuals with more severe alcohol addiction problems had increased chances of committing multiple offenses regardless of the sanctions that they had experienced relative to those with less severe alcohol-related problems. Findings seemed to suggest that criminal justice sanctions alone might not obtain expected deterrent impacts on individuals with alcohol and other addiction problems. Drinking drivers and other drug and alcohol offenders should be screened for substance abuse problems, and, if necessary, provided with treatment.  相似文献   
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