Recognising the potential conservation impact, zoos regularly ask their visitors to undertake pro-wildlife behaviour. This paper presents the results of two studies undertaken to address the question: how often during a visit should visitors be asked? Study 1 sought to a) determine individuals' personal thresholds and b) the point where the number of different behaviours requested began affect visitors' experiences. Study 2 sought the same, but focused on requests for the same behaviour. Results suggest that few respondents' personal thresholds were crossed (2.5% in Study 1 and 9% in Study 2). In neither study did many respondents (2.5% in Study 1 and 2.8% in Study 2) feel that the number of requests negatively affect their overall zoo experience. While there are caveats, we conclude that there appears little cause for concern about asking zoo visitors on multiple occasions to act in support of wildlife. Indeed, such requests may improve experiences. 相似文献
This paper estimates the magnitude of the Balassa-Samuelson effect for Greece. We calculate the effect directly, using sectoral
national accounts data, which permits estimation of total factor productivity (TFP) growth in the tradeables and nontradeables
sectors. Our results suggest that it is difficult to produce one estimate of the BS effect. Any particular estimate is contingent
on the definition of the tradeables sector and the assumptions made about labour shares. Moreover, there is also evidence
that the effect has been declining through time as Greek standards of living have caught up on those in the rest of the world
and as the non-tradeables sector within Greece catches up with the tradeables.
This study revisits the issue of mean reversion in the import rice prices of six Asian countries over the period between 1995 and 2015. Augmented Dickey Fuller tests with a conventional linear regression model support the presence of a unit root in the levels of the price data. However, when regressions allow for Markov switching in coefficients and variances to capture periodic shifts in levels and volatilities, there is strong evidence against the unit‐root null hypothesis in favor of stationarity over much of the observation period. 相似文献
Mandatory country of origin labeling (COOL) has become a thorny issue in U.S.–Canada bilateral trade relations. We undertake an ex post investigation of the impact of the law on U.S. imports of Canadian beef, feeder, and fed cattle. Using a partial equilibrium framework, we derive U.S. import demand equations for Canadian cattle and beef, and employ the Bai and Perron (1998, 2003) procedure for detecting multiple structural breaks with break points being endogenously determined. We find evidence that COOL may have caused significant structural change in U.S. imports of Canadian feeder and fed cattle. L’étiquetage du pays d'origine obligatoire est devenu un sujet épineux des relations commerciales entre le Canada et les États‐Unis. Dans la présente étude, nous effectuons une analyse ex post des répercussions de la Loi sur les importations américaines de viande de b?uf, de bovins d'engraissement et de bovins finis. À l'aide d'un modèle d’équilibre partiel, nous avons dérivé des équations de demande d'importation de bovins et de viande de b?uf de la part des États‐Unis et nous avons utilisé les tests de Bai et Perron (1998, 2003) pour déceler les ruptures structurelles multiples, dont les points de rupture ont été déterminés de façon endogène. Les résultats de notre étude montrent que l’étiquetage du pays d'origine peut avoir causé un changement structurel considérable sur les importations de bovins d'engraissement et de bovins finis. 相似文献
Patents serve as an indicator of the innovation capability of countries, industries, or firms. Many Indian firms are in a transition to move from labor intensive segments to areas with higher value added which has been reflected in this research. The purpose of this study is to analyze patents issued during the period of 1997–2009 from the European Patent Office database and the United States Patent and Trademark Office database from the top one hundred Indian information technology firms. This study represents a novel empirical look at information technology industry innovations in India. A comprehensive set of statistical patent analyses are presented to provide practitioners with valuable knowledge to assist in business strategic planning. 相似文献
The paper compares free trade with autarky in an asymmetric multi‐country world under Cournot competition with constant returns to scale and linear demand. We derive respective conditions under which free trade will hurt a country's consumers, benefit its firms, induce it to export, increase its output and raise its welfare. We show that these conditions are linked in a clear order, with one implying the next. We further demonstrate that free trade can reduce world total output and total consumer surplus as well as world welfare. Along the way, we correct several oversights in the literature. 相似文献
The literature can justify both increasing and decreasing marginal taxes (IMT & DMT) on top incomes under different welfare objectives and income distributions. Even when DMT are theoretically optimal, they are often politically infeasible. Then a flat tax seems to be a constrained optimal solution. We show however that, given any flat tax we can increase the total utility of a poor majority by raising the top income tax rate under a simple condition, which can be checked with empirical data. We further generalize our main results allowing different welfare weights, declining elasticity of labor supply and more tax bands. 相似文献
This paper studies industry evolution driven by non strategic learning by doing and spillovers. We characterize a dynamic process of cost and output changes and its effect on welfare and industry profits. The paper gives conditions for shakeouts to occur and analyzes the key factors affecting these conditions. Since shakeouts could lead to a long-run social loss due to higher market concentration, there is a role for a government to play in limiting unnecessary shakeouts. The most effective way to do so is to enhance spillovers.JEL Classification:
L11, L13, O31Correspondence to: Michael TroegeWe would like to thank Hans Mewis, Christophe Moussu and an anonymous referee for valuable comments and suggestions. We also benefited from comments of seminar participants at WZB, Humboldt University, Northwestern University and the EEA/ESEM 1999 meetings. Part of the research was carried out while Michael Tröge was visiting Northwestern University. Financial support by the German Research Council (DFG) is gratefully acknowledged. 相似文献
In mixed strategy games, the ability to randomize decisions is a critical strategic necessity, yet studies show that such rational behavior is sometimes elusive. This paper examines mixed strategy play in a natural setting, by looking at a pitcher’s decision to throw the ball to home plate or to throw it to first base in a pickoff play. In the absence of significant pressure, we find that pitchers can effectively randomize their sequence of choices to remain unpredictable, as mixed strategy Nash equilibriums require. However, in the face of pressure, some pitchers are less able to randomize their choices. Our paper is the first empirical study in the English language literature to find that decision makers are unable to randomize their strategic decisions when they face an increased cognitive load due to pressure.