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31.
In this study, we investigate the effects of stock short-sale constraints on options trading by exploiting two US Securities and Exchange Commission rule changes under Regulation SHO: Rule 203 (locate and close-out requirements) and Rule 202T (temporary removal of short-sale price tests). We find that stock short selling activities decrease (increase) significantly after Rule 203 (Rule 202T) implementation, supporting the validity of Rule 203 (Rule 202T) as an exogenous increase (decrease) in short-sale constraints. Options volume increases significantly after Rule 203 went into effect and the result is more pronounced among firms with lower levels of institutional ownership and smaller options bid-ask spreads. Therefore, the evidence from Rule 203 suggests that investors may use options as substitutes for stock short sales when short selling is less feasible or more costly due to the locate and delivery requirements. In contrast, we find no significant change in the options trading volume of pilot stocks during the pilot program of Rule 202T. Overall, our results indicate that the impact of short-sale constraints on options trading varies with the types of constraints affected. 相似文献
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The effectiveness of information interventions to improve domestic food safety among rural consumers
Consumer education on food handling behavior is regarded as an effective method to improve domestic food safety and prevent foodborne illness, but is usually overlooked in rural areas. Using a presurvey and two rounds of postsurveys targeted at rural consumers from China included in a randomized controlled trial, this study investigated the effectiveness of two information interventions—a leaflet with tips for best practices and the leaflet plus consumer education sessions conveyed by phone—and compared them with a control group. Cloth use behavior was the target in the trial and five specific aspects were evaluated: (1) whether the cloth was made of old clothes, (2) whether the one used to clean kitchen tables was also used to wash dishes, (3) whether it was hung to dry, (4) how it was disinfected, and (5) how long the cloth was used before being discarded. Firstly, consumers' behavior was scored by summing the above-mentioned five behaviors. The results estimated using the difference-in-difference model showed that respondents in the leaflet-only group improved to a greater extent than those in the control group, but their difference in progress was not statistically significant until the second round of the postsurvey. Respondents in the leaflet-plus-phone group were quicker to adopt suggested practices and made discernible improvements compared with those in the leaflet-only group in the first round of the postsurvey, but the gap between these groups narrowed to statistically insignificant in the second round of the postsurvey. It was concluded that one consumer education session was effective and made a difference in the long term, whereas more education sessions produced normative behavior at faster rates, showing a significant improvement in the short term. Then, the study estimated the effectiveness of interventions on the five specific behaviors separately. The results were estimated using a probit difference-in-difference model and showed that the suggested behaviors with lower costs or a greater difference from past behaviors were more likely to be adopted by consumers. Consumer education facilitates proper food handling practices among rural households, which should be considered by policy makers. 相似文献
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2007年,青岛被批准为第六个国家动漫创意产业基地.目前拥有各类动漫企业40余家,其中网络游戏、影视动画、多媒体设计企业30余家,游戏研发、运营企业10余家.从业人员近千人,动漫、网络游戏及相关衍生产品企业年销售收入已经达到了8亿多元. 相似文献
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<正>随着知识经济时代的到来,知识管理成为专家学者、商界精英关注的焦点。国际大公司多数通过知识管理有效地降低成本、提高生产效率,为自身发展带来了客观的收益。现代意义的知识管理在中国出现虽然仅仅十几年的时间,但这十几年正是中国改革开放力度不断加大,经济高速增长、国际化程度越来越高的十几年。在这一过程中,知识管理在中国从理论萌芽、借用他山之石的起步阶 相似文献
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席袆静 《中国对外贸易(英文版)》2011,(6)
本文试图对此作深入剖析,以期在金融危机和日益严峻的生态危机挑战中,对各地政府更好的服务企业,更好的保障民生,更好的扩内需促消费,发展商贸服务业,促进地方经济又好又快的发展提供一种选择. 相似文献
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借鉴高新技术产业发展的经验,可以促进战略性新兴产业的发展.通过自主创新技术可以不断深化形成产业技术轨道,同时带动相关产业的不断发展和相关技术的成熟与跨越. 相似文献
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