首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   191篇
  免费   14篇
财政金融   19篇
工业经济   10篇
计划管理   22篇
经济学   69篇
综合类   3篇
运输经济   7篇
旅游经济   3篇
贸易经济   29篇
农业经济   31篇
经济概况   12篇
  2023年   1篇
  2022年   3篇
  2021年   6篇
  2020年   6篇
  2019年   5篇
  2018年   6篇
  2017年   4篇
  2016年   7篇
  2015年   10篇
  2014年   4篇
  2013年   29篇
  2012年   11篇
  2011年   13篇
  2010年   11篇
  2009年   9篇
  2008年   11篇
  2007年   8篇
  2006年   9篇
  2005年   5篇
  2004年   6篇
  2003年   7篇
  2002年   11篇
  2001年   8篇
  2000年   1篇
  1999年   5篇
  1997年   3篇
  1996年   2篇
  1995年   1篇
  1993年   1篇
  1989年   1篇
  1980年   1篇
排序方式: 共有205条查询结果,搜索用时 916 毫秒
61.
The cereal, oilseeds, and protein crop sector (COP) occupies a prominent position within the European Union's agricultural sector. Within Spain, the COP sector accounts for almost a third of total Agricultural Guidance and Guarantee Fund expenses, and half of the utilized agricultural area (UAA). The COP sector is not only relevant because of its physical and economic magnitude, but also because of the political attention it receives. The Common Agricultural Policy (CAP) reforms that occurred during the 1990s paid special attention to this sector. This article aims to determine the impacts of Agenda 2000 on a sample of Spanish COP farmers' production decisions by using an output-oriented stochastic distance function. The distance function allows for an assessment of the reform-motivated changes on total output, input used, input composition, and crop mix. It also permits an assessment of the impacts of the reform on farms' technical efficiency.
Results show that the reform has shifted the production frontier inward and changed output composition in favor of voluntary set-aside land. With respect to input composition, Agenda 2000 induced a decrease in land, fertilizers, pesticides, and other inputs in favor of labor. In addition, Agenda 2000 has had a negative impact on technical efficiency.  相似文献   
62.
This article investigates the degree of persistence in several weekly and monthly agricultural prices (corn, soybeans, barrow and gilts, and milk) using long memory (fractional integration) techniques. The results indicate mean reversion (i.e., orders of integration smaller than one) in some of the agricultural prices like corn, milk, and barrow and gilts when the disturbances are autocorrelated. Further, we examine the stability across time in the degree of dependence, and the results indicate that the fractional differencing parameters have not remained constant across time. When we take into account a structural break we find that during the first subsamples, the series are stationary though highly persistent, with orders of integration close to 0 and with large autoregressive coefficients. However, for the periods after the break, the series seem to be nonstationary I(1). Dans le présent article, nous avons étudié le degré de persistance des prix hebdomadaires et mensuels de plusieurs produits agricoles (maïs, soja, castrats et cochettes, lait) à l’aide de tests de mémoire longue (intégration fractionnaire). Nos résultats indiquent une stationnarité (c.‐à.‐d. des ordres d’intégration inférieurs à un) des prix de certains produits agricoles, tels que le maïs, le lait, les castrats et cochettes, lorsque les perturbations sont autocorrélées. Nous avons également étudié la stabilité du degré de dépendance à travers le temps, et nos résultats indiquent que les paramètres de différenciation fractionnaire ne sont pas demeurés constants. Lorsque nous avons tenu compte d’une rupture structurelle, nous avons trouvé que dans les premiers sous‐échantillons, les séries étaient stationnaires quoique très persistantes, avec des ordres d’intégration près de 0 et d’importants coefficients d’autorégression. Dans le cas des périodes suivant la rupture, les séries semblaient non stationnaires I(1).  相似文献   
63.
Experimental auctions are normally conducted using single‐unit auctions. In this paper, we use the multiunit Vickrey auction to assess the determinants of consumers’ willingness to pay (WTP) for organic milk in a multiunit shopping scenario. We also analyze the effect of positive and negative information about organic farming on WTP. Our results suggest that consumers are willing to pay a premium for organic milk but that this WTP decreases with the number of units purchased. Results also suggest that health issues, high price of organic foods, taste, and lack of information on organic foods are factors that influence WTP for organic milk. The type of information provided also plays a relevant role. Specifically, we found that subjects’ WTP responds positively to positive information about organic farming and responds negatively to negative information. The provision of both positive and negative information does not affect WTP. Les enchères expérimentales sont en règle générale effectuées sous un cadre d’enchères de Vickrey à une seule unité. Dans le présent article, nous avons utilisé l’enchère de Vickrey à unités multiples pour évaluer les déterminants du consentement à payer (CAP) des consommateurs pour du lait biologique dans un contexte d’achats multiples. Nous avons également examiné les répercussions que l’information positive et négative à l’égard de l’agriculture biologique a sur le CAP. Nos résultats autorisent à penser que les consommateurs sont prêts à payer un prix plus élevé pour obtenir du lait biologique, mais que ce CAP diminue avec le nombre d’unités achetées. Nos résultats autorisent aussi à penser que les aspects liés à la santé, le prix élevé des aliments biologiques, le goût et le manque d’information sur ces aliments sont des facteurs qui influencent le CAP pour du lait biologique. Le type d’information joue également un rôle important. Nous avons observé que le CAP réagit favorablement à de l’information positive sur l’agriculture biologique et défavorablement à de l’information négative. La diffusion simultanée d’information positive et négative n’influence pas le CAP.  相似文献   
64.
In this paper we try to evaluate the asymptotic fairness of bonus-malus systems, assuming the simplest case when there is no hunger for bonus. The asymptotic fairness has to be understood as the bonus-malus system ability in assessing the individual risks in the long run. Firstly we define the asymptotic fairness of a bonus-malus system following an expression that can be found in J. Lemaire [1985]: Automobile Insurance. Actuarial Models. Dordrecht: Kluwer-Nijhoff Publishing, p. 168. Secondly, we define a measure of the global asymptotic fairness considering the structure function of the risk group. Finally we try to calculate, for each set of transition rules and a given structure function, the scale of premiums that brings the global asymptotic fairness closest to the ideal situation where each insured pays in the long run a premium corresponding to its own claim frequency. This is possible thanks to the application of a multiobjective optimization technique named Goal Programming.  相似文献   
65.
The importance of concession sales in the movie exhibition industry is widely acknowledged among economists and other social scientists that have studied this industry in the past. Despite this recognition, the lack of appropriate data has constrained existing studies that document the role that concessions play in movie theaters. Using detailed weekly movie theater data on concession sales, box office revenues and transaction characteristics from a major exhibitor in Spain, we shed light on the relation between concession sales and the following factors (i) theater attendance, (ii) non-traditional channels of ticket distribution, (iii) audience composition, and (iv) theater and market specific factors.   相似文献   
66.
67.
We show that, in a range of market conditions, an ever stricter environmental policy does not always lead to ever cleaner production methods and ever lower production of polluting goods. We consider an integrated technology, where firms can reduce their emission intensities in a continuous fashion. Analogous to the previous literature we find that firms' emission intensities can be U‐shaped in the strictness of policy, but we show that this applies only under low profitability conditions. Under high profitability conditions, output levels are U‐shaped in the strictness of the policy. The latter result is new in the literature. In the case where the U‐shape arises in emission intensities, the minimum is reached where the marginal abatement cost curves intersect.  相似文献   
68.
Agro-terrorism is a hostile attack, towards an agricultural environment, including infrastructures and processes, in order to significantly damage national and international political interests. This article provides a framework for reducing agro-terrorism-related risks by either means of foresight (prevention) or early detection of exotic/foreign pathogenic agents and their dispersion patterns. It focuses on intention detection using overt data sources on the World Wide Web as they relate to agro-terrorism threats. The paper defines agro-terrorism, examines data characteristics, identifies weaknesses among the intelligence community that must be addressed, then integrates the classical intelligence cycle for early detection that may lead to prevention of such acts.  相似文献   
69.
This study compares returns from the traditional buy and hold (B&H) strategy to well-known technical oscillators applied to diverse indices leading the global market (DJI, FTSE, NK225 and TA100) during the period 2007–2012. Our aim was to establish whether technical tools can consistently achieve returns exceeding those of the B&H strategy across various financial markets. We found the relative strength index (RSI) to be the best oscillator, outperforming the DJIA, the FTSE100 and the NK225 for five of the six years examined. The only index that did better than the RSI was TA100, which outperformed all the examined oscillators. In second place was the moving average convergence/divergence (MACD) oscillator, which outperformed the NK225 B&H strategy and came in second for TA100. The results show that during bear markets the RSI and MACD generally produce better gains than the indices, while the opposite occurs during bull markets.  相似文献   
70.
Our article assesses the impacts regarding on-farm investment and production decisions resulting from the Partially Decoupled (PD) payment scheme implemented during the 1990s and first half of the 2000s within the framework of the Common Agricultural Policy (CAP). The Spanish Cereal, Oilseed and Protein (COP) sector is taken as a case study regarding this effect due to its economic and political relevance in Spain. The empirical analysis is applied to farm-level data from 2000 to 2004 using the Farm Accountancy Data Network (FADN). We use a reduced-form application of the dual model of investment under uncertainty and estimate a system of censored and uncensored equations. PD payments are found to increase short-run production and generate a statically significant increase in the investment in farm assets. Results also show the importance of assessing the effects of PD payments in a dynamic framework as applied in this article.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号