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71.
Little research has examined how gain- and loss-framed options influence participants’ affective states. In the current paper, we present two studies that measure affective responses to framed options to identify a potential mediator of the relation between frame and choice. We found that participants reported more positive responses after reading gain-framed options that presented a certain outcome compared to loss-framed options that presented a certain outcome, consistent with the choice patterns of the framing effect. We also found that framing effects were mediated by affective evaluation of the options. We suggest future researchers continue to assess the influence of affective response on evaluating options and making decisions.  相似文献   
72.
Economic analysis of chemical pesticide use has shown that the interactions between plants, pests, damage control technology and state of the ecosystem are important variables to be considered. Hence, a bio-economic model was developed for the assessment of Bt variety and pesticide-based control strategies of the cotton-bollworm in China. The model simulates plant growth, the dynamics of pest populations and of natural enemies. The model predictions are used as major inputs for a stochastic micro-level profit model of alternative control strategies.Results show that: (1) productivity effects of Bt varieties and pesticide use depend on the action of natural control agents, and (2) the profitability of damage control measures increases with the severity of ecosystem disruption. The findings highlight the importance of the choice of the counterfactual scenario in the assessment of the impact of agricultural biotechnology. Also, some doubts are raised whether the high benefits of Bt cotton varieties claimed by previous studies based on cross section comparisons are realistic.  相似文献   
73.
The OECD produces two–year–ahead growth forecasts for the G7–countries since 1987; these forecasts have never been evaluated. A regression is developed that tests for the information content of the forecasts. The idea is that this content is the added value forecasters incorporate in their forecasts. The information content is defined relative to the forecast for the previous year. In the end, the added value contained in the current year forecast is calculated relative to the last observation. The test consists in checking whether the information content reduces the forecasts error.

The study begins with a calculation of the usual accuracy statistics. These indicate an extreme low quality for the forecasts. The regression tests support this conclusion although the forecasts for Japan do possess some information. Alarming for users of forecasts is that there are no obvious alternatives.  相似文献   
74.
This study adopts a cross‐sectional spatial approach to examine the relationship between transport infrastructure, population location, and agricultural production in Sub‐Saharan Africa using new data obtained from geographic information systems (GIS). We find that both population and agricultural production are spatially concentrated near large cities, with 41.4% of population and 23.6% of agricultural production (in value terms) within 2.5 hours travel time to large cities. Taking into account agroecological and other factors, we find a statistically significant association between travel time and agricultural production. Using coefficients estimated for Mozambique, we simulate the effects of hypothetical increases in road investments on travel times and agricultural production, suggesting that improvements in road infrastructure could facilitate a substantial increase in agricultural production.  相似文献   
75.
Water is and will continue to be the key natural resource of the twenty-first century in all nations, large and small. While the agricultural sector is the largest user of water, its use for human consumption and in industrial processes is truly vital. A wide variety of equipment and chemicals are involved in cleansing water and wastewater; the global market is estimated at $84 billion in 2017 and at $123 billion in 2022. This study analyzes the specific categories of equipment and chemicals, the nature of end-use markets, and the creative business strategies involved. Comments on competition and marketing practices as well as two brief case studies provide further insights on this important industrial sector  相似文献   
76.
In this paper, I describe the qualitative methods deployed in a series of investigations examining post-disaster recovery following Hurricane Katrina. I argue that qualitative methods, particularly ethnographic field interviews, are essential tools in contexts that the interpretive frameworks (mental models) of the research subjects play a dominant role in shaping broader patterns of social coordination. Given the importance, Austrian economists attribute to non-deterministic learning as the source of endogenous change and discovery in contexts of genuine uncertainty; I argue that this underutilized set of tools ought to be considered particularly valuable.  相似文献   
77.
High rates of undernutrition persist in Afghanistan, but community-level information is scarce on its underlying causes. Developing policy in such situations is affected by varying stakeholder perspectives on the issues. This study uses the UNICEF malnutrition framework and a rapid assessment methodology to compare how stakeholders at community, provincial and national levels describe the food and nutrition situation. Consistent differences in problem definition by administrative level and between agriculture and health sectors were apparent. Stakeholders at all administrative levels widely agreed on the need to improve incomes and employment to ensure food security because of the many constraints to agricultural production. Provincial and national level stakeholders further agreed on the need for nutrition education at all levels of society. The research illustrates how local adaptation and application of the UNICEF malnutrition framework can reveal divergent perspectives, as a first step toward finding common ground and an appropriate policy response.  相似文献   
78.
This article focuses on a defining concept of modern surfing: localism. Using a qualitative ethnographic approach, the data for this study were collected using participant observation, field notes and interviews between 2008 and 2009 with a significant population of local surfers in a village location in Cornwall, South West of England, UK. Developing Bennett’s definition of localism, data suggested a benign form of localism and in conveying this, we make a number of associated observations. Our analysis considers how a process of Othering led to the construction of Established Insiders based primarily on location, rather than gender. These Established Insiders saw the need to protect their community and its way of life from Outsiders. The focal point for protection was the liminal space/phase that opened up on ‘their’ local waves, as it was through temporal space that communitas was generated and thus community sustained. We illustrate how benign localism was exacerbated by overcrowding and how local surfers’ experiences of localism made them aware of their becoming Outsiders in other surfing localities, modifying their behaviour accordingly. The paper also suggests that debates about localism need to view the concept as a continuum of attitudes and behaviours ranging from the benign to the heavy, and that attention needs paying to how localism varies between contexts and the ways in which localism may share social antecedents. Lastly, we highlight the utility of viewing the beach and wave as liminal spaces that give rise to communitas for those who surf it together regularly.  相似文献   
79.
80.
Our purpose here is to engage in a cross-disciplinary discussion between Austrian economics and social network theory. In particular, we ask what role social networks play in the extended order in regard to both individual discovery and whether social networks can be the source of widespread unintended cooperation among individuals unknown to one another. Although Austrians have examined the function that market prices play in generating social cooperation, such discussions tend to steer clear of non-priced environments, such as interaction within social networks. We seek to explore this gap. While we acknowledge that non-price information feedback mechanisms such as status and reputation lack the calculability so crucial to market coordination, we argue that they can nonetheless mimic other important qualities of market prices and generate widespread unintended social cooperation among people unknown to one another. After a general discussion, we apply these ideas to online philanthropic communities.  相似文献   
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