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Previous research showing that union wage premiums actually rose from the late 1970s to the mid-1980s suggests that concession bargaining was more media hype than the result of a fundamental change in collective bargaining. Our study found that nonrandom attrition of workers from the union sector does lead to an upward bias in the measured growth of union premiums, but concession bargaining was not a sufficiently widespread occurrence to reduce the size of union premiums during the sample period. 相似文献
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MARK RUBINSTEIN 《The Journal of Finance》1984,39(5):1503-1509
Under conditions consistent with the Black-Scholes formula, a simple formula is developed for the expected rate of return of an option over a finite holding period possibly less than the time to expiration of the option. Under these conditions, surprisingly, the expected future value of a European option, even prior to expiration, is shown equal to the current Black-Scholes value of the option, except that the expected future value of the stock at the end of the holding period replaces the current stock price in the Black-Scholes formula and the future value of a riskless invesment of the striking price replaces the striking price. An extension of this result is used to approximate moments of the distribution of returns from an option portfolio. 相似文献
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ANDREW T. KACZYNSKI MARK E. HAVITZ RONALD E. McCARVILLE 《Leisure Sciences: An Interdisciplinary Journal》2013,35(3):241-261
This research was conducted to examine the efficacy of repositioning public parks and recreation services in the public mind. Respondents were recruited at various venues throughout a large Canadian city and randomly assigned to one of five groups. After reading hypothetical newspaper format articles, respondents completed questionnaires investigating their beliefs, attitudes, and behavioral intentions regarding a local recreation agency's efforts to reduce youth crime. Four treatment messages contained various combinations of real, psychological, and competitive repositioning messages, while a control group received no information. All types of repositioning messages were effective in improving beliefs and behavioral intentions, but not attitudes. There was no significant evidence that numerical treatment messages were more effective than non-numerical messages or that the cumulative effects of various repositioning messages were more effective than a single type of message. Discussion focuses on efficacy of various framing messages, on suggestions for future research related to repositioning, and on considerations related to social marketing efforts of this nature. 相似文献
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Electronic medical records (EMRs) have tremendous potential to lower consumer medical costs and improve quality, yet their use in the United States remains extremely low. We explain the reasons for this market failure and then document the strikingly parallel problems in the lending market one hundred years ago. We investigate how the evolution of credit bureaus helped address market limitations in lending, and ask whether similar entities—what we call health information bureaus—might overcome similar problems in EMR adoption and interconnection. 相似文献