International Advances in Economic Research - Based on transaction-cost and resource-based theories (and other approaches), there is an extensive literature on the range of factors that are viewed... 相似文献
We examine the distributional impact of large dams on cropland productivity in Africa. As our unit of analysis we use a hydrology based spatial breakdown of the continent that allows one to exactly define regions in terms of their upstream/downstream relationship at a highly disaggregated level. We then use satellite data to derive measures of cropland productivity within these areas. Our econometric analysis shows that while regions downstream benefit from large dams, no beneficial effects accrue to cropland within the vicinity. Moreover, we find that the productivity enhancing impact of upstream dams is dependent on the local climate. Overall our results suggest that upstream dams have quantitatively on average provided up to 12% of the minimum daily per capita amount of kilocalorie needs in downstream communities and increased agricultural production by 1%. 相似文献
Driven by the proliferation of augmented reality (AR) technologies, many firms are pursuing a strategy of service augmentation to enhance customers’ online service experiences. Drawing on situated cognition theory, the authors show that AR-based service augmentation enhances customer value perceptions by simultaneously providing simulated physical control and environmental embedding. The resulting authentic situated experience, manifested in a feeling of spatial presence, functions as a mediator and also predicts customer decision comfort. Furthermore, the effect of spatial presence on utilitarian value perceptions is greater for customers who are disposed toward verbal rather than visual information processing, and the positive effect on decision comfort is attenuated by customers’ privacy concerns. 相似文献
Understanding the emergence of innovation systems is recently put central in research analysing the process of technological change. Especially the key activities that are important for the build up of an innovation system receive much attention. These are labelled ‘functions of innovation systems’. This paper builds on five empirical studies, related to renewable energy technologies, to test whether the functions of innovation systems framework is a valid framework to analyse processes of technological change. We test the claim that a specific set of functions is suitable. We also test the claim made in previous publications that the interactions between system functions accelerate innovation system emergence and growth. Both claims are confirmed. 相似文献
Background: Validation of overall survival (OS) extrapolations of immune-checkpoint inhibitors (ICIs) during the National Institute for Health and Care Excellence (NICE) Single Technology Assessment (STA) process is limited due to data still maturing at the time of submission. Inaccurate extrapolation may lead to inappropriate decision-making. The availability of more mature trial data facilitates a retrospective analysis of the plausibility and validity of initial extrapolations. This study compares these extrapolations to subsequently available longer-term data.
Methods: A systematic search of completed NICE appraisals of ICIs from March 2000 to December 2017 was performed. A targeted search was also undertaken to procure published OS data from the pivotal clinical trials for each identified STA made available post-submission to NICE. Initial Kaplan-Meier curves and associated extrapolations from NICE documentation were extracted to compare the accuracy of OS projections versus the most mature data.
Results: The review identified 11 STAs, of which 10 provided OS data upon submission to NICE. The extrapolations undertaken considered parametric or piecewise survival models. Additional data cut-offs provided a mean of 18 months of OS beyond the end of the original data. Initial extrapolations typically under-estimated OS from the most mature data cut-off by 0.4–2.7%, depending on the choice of assessment method and use of the manufacturer- or ERG-preferred extrapolation.
Conclusion: Long-term extrapolation of OS is required for NICE STAs based on initial immature OS data. The results of this study demonstrate that the initial OS extrapolations employed by manufacturers and ERGs generally predicted OS reasonably well when compared to more mature data (when available), although on average they appeared to underestimate OS. This review and validation shows that, while the choice of OS extrapolation is uncertain, the methods adopted are generally aligned with later-published follow-up data and appear appropriate for informing HTA decisions. 相似文献
The European Treaty supports the application of the polluter pays principle in all environmental policies including the Water
Framework Directive. This paper assesses the efficiency of water-charging systems in two European regions. The regions examined
are the South west region of Ireland and the Navarre region in Spain which were selected because they are similar in terms
of economic indicators but different in terms of water pricing structures. The paper describes the development and application
of a simple model to analyse data on water-charging systems from these two regions. We present the results of a detailed scenario-based
investigation illustrating the differences between experience, composition and basis, impact and constraints on the application
of water charges for both regions. The key findings are that existing water charges do not provide incentives for users to
use water efficiently and thereby do not contribute effectively to the environmental objectives of the Water Framework Directive. 相似文献
American agriculture is suffering from severe structural adjustments and from its worst financial depression since landmark price and income policies were legislated more than half a century ago. As much as one-third of the $220 billion in agricultural debt is now delinquent, nonaccrual, or subject to renegotiation. Land values have fallen precipitously in the past few years. Farm foreclosures are near 1930 Depression levels. The congressional debate over programs that could determine the course of U.S. agriculture for the remainder of the century began in the summer of 1985. 相似文献
Drawing on recent advances in exchange rate regime classifications, the paper examines empirically the effect of exchange rate regimes on foreign direct investment (FDI) flows to developing countries. Using system generalized methods of moments estimation on a panel of 70 developing countries for the period 1985–2004, we find that developing countries adopting de facto fixed or intermediate regimes significantly outperform those opting for a flexible exchange rate system in attracting FDI flows. No statistically significant differences in the FDI‐inducing properties of fixes, intermediates and floats are found using the International Monetary Fund official classification. 相似文献
Utilizing Resource-Advantage Theory as the underlying theoretical foundation and drawing on literature from a variety of disciplines, we develop a market-oriented sustainability framework. By incorporating sustainability into market orientation, the goal of strategic alignment of sustainability with marketing strategies is achieved to create a competitive advantage. Three constructs identified in the model are DNA, stakeholder involvement, and performance management. These three constructs are the drivers of sustainability. DNA is used as an extended metaphor to clarify and illustrate the workings of an organization and how sustainability may be implemented. This construct includes core ideology, dynamic capabilities, and societal engagement. The firm’s DNA is communicated to both internal and external stakeholders, and stakeholders’ concerns should be an influence on strategic marketing planning. Performance management is the third major construct in the model and includes corporate social performance and corporate financial performance metrics. Within the model explication, we offer propositions to support market-oriented sustainability research and provide directions for sustainability theory, research, and practice. 相似文献