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   3120篇
  免费   81篇
  国内免费   1篇
财政金融   361篇
工业经济   213篇
计划管理   482篇
经济学   714篇
综合类   21篇
运输经济   36篇
旅游经济   41篇
贸易经济   640篇
农业经济   91篇
经济概况   599篇
邮电经济   4篇
  2023年   26篇
  2022年   17篇
  2021年   35篇
  2020年   71篇
  2019年   93篇
  2018年   126篇
  2017年   145篇
  2016年   158篇
  2015年   70篇
  2014年   100篇
  2013年   315篇
  2012年   159篇
  2011年   166篇
  2010年   99篇
  2009年   112篇
  2008年   104篇
  2007年   88篇
  2006年   81篇
  2005年   123篇
  2004年   109篇
  2003年   77篇
  2002年   44篇
  2001年   40篇
  2000年   33篇
  1999年   47篇
  1998年   30篇
  1997年   27篇
  1996年   29篇
  1995年   26篇
  1994年   27篇
  1993年   22篇
  1992年   20篇
  1991年   20篇
  1990年   21篇
  1989年   21篇
  1988年   20篇
  1987年   22篇
  1986年   17篇
  1985年   18篇
  1984年   16篇
  1982年   18篇
  1981年   17篇
  1980年   20篇
  1979年   9篇
  1978年   12篇
  1975年   10篇
  1969年   11篇
  1965年   9篇
  1946年   8篇
  1942年   10篇
排序方式: 共有3202条查询结果,搜索用时 0 毫秒
61.
The paper investigates whether patent fees are an effective mechanism to deter the filing of low‐quality patent applications. The study analyzes the effect on patent quality of the Patent Law Amendment Act of 1982, which resulted in a substantial increase in patenting fees at the U.S. Patent and Trademark Office. Results from a series of difference‐in‐differences regressions suggest that the increase in fees led to a weeding out of low‐quality patents. About 10% of patents in the lowest quality decile were filtered out, with the effect concentrated in the patents of firms whose overall patent portfolio was medium to large (more than 20 patents). The study has strong policy implications in the current context of concerns about declines in patent quality.  相似文献   
62.
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   
63.
Ecotourism in private reserves combines the establishment of protected areas with an incentive mechanism to conserve biodiversity. Brazil's private reserve system is well-established but little is known about its links to tourism. This study puts the global private protected area into context and quantifies the extent to which ecotourism has been adopted as a sustainable land-use practice on private reserves in Brazil. Our findings demonstrate that small reserves do contribute to conservation and are used for ecotourism. The belief that large reserves are necessary for ecotourism and conservation is challenged. Only 4% (n = 45) of the 1182 reserves are engaged in ecotourism, mainly those within the Atlantic Forest biome and these are generally small in size (<50 ha). Reserves provide modest to basic accommodation as well as education and economic opportunities that include adjacent communities. Hiking and bird watching are the most popular activities but many reserves are threatened by poaching and invasive species. The low adoption of ecotourism appears due to a combination of factors, including lack of landowner interest, constraints imposed by regulations, logistics and anthropogenic threats. Nonetheless, there is potential to expand ecotourism within private reserves as 143 further private reserves are located near those already engaged in ecotourism.  相似文献   
64.
This paper starts from the stylized fact that firm size and exporting tends to be positively related. Using large sets of establishment panel data for three different industries from official statistics, evidence is presented that the familiar picture of an export/sales ratio that increases (at a decreasing rate) with firm size vanishes if unobserved firm heterogeneity is controlled for in a fixed-effects fractional logit regression model. This finding is well in line with the fact that many small firms are “hidden export champions.” JEL no. F10, D21, L60  相似文献   
65.
This paper analyzes the demand of French farmers for pesticides by disaggregating among the three main categories of pesticides. We estimate the demand elasticities of herbicides, insecticides, and fungicides with respect to pesticide expenditure, and also consider crop differentiation. We retain a Linear Approximated Almost Ideal Demand System specification. A Full‐Information Maximum Likelihood estimation procedure is used to deal with corner solution problems and censored data. The estimation is based on two cross‐sections covering pesticide use of three major crops cultivated in France in 2001 and 2006. Our results show that farmers' response to price variation is very low, especially for 2001. Furthermore, elasticities of pesticide expenditure are significantly different across categories: the highest levels are obtained for fungicides and the lowest ones for insecticides. Finally, we find higher own‐price elasticities for herbicides and fungicides than for insecticides, which are less frequently used.  相似文献   
66.
We present a meta-analysis of cycle periods in historical socio-economic data found in the K-wave literature. The literature on stochastic and deterministic cycles in variables such as the consumer price index, employment, interest rates, commodity prices, GDP, war and hegemony is huge and scattered. However our meta-analysis reveals various commonalities. Our key finding is that there is a common set of cycle periods that is common across most socio-economic variables.  相似文献   
67.
The optimal constitution is one that protects people from politicians' thirst of power and preserves citizens' civic virtues. This paper presents a model that blends David Hume's (1741) consideration that in politics every man ought to be supposed a knave, with John Stuart Mill's (1861) conception of self-interested politicians. The optimal constitution is proved to be feasible. However, there are two possible equilibria, the Frey and Brennan-Buchanan equilibrium. It is shown that Bruno Frey's (1997) crowding-in and crowding-out analysis is a particular case of our model. In the Brennan-Buchanan equilibrium there is a long-run neutrality of enforcement on citizens' performance. In general, a trade-off is expected between the optimal number of laws and enforcement. The comparison between the equilibria shows that the Frey equilibrium is the best option to enhance the civic virtues of citizens, while the Brennan-Buchanan equilibrium is the best way to deter the ambitions of self-interested politicians.  相似文献   
68.
This paper investigates the relationship between subjective expectations regarding the replacement rate of income at retirement and several measures of pension satisfaction. We use panel data on Dutch employees, analyzed with fixed effects models, allowing for correlation between unobserved heterogeneity in satisfaction and optimism or pessimism in expectations. The level of the expected replacement rate is found to be positively related to satisfaction: respondents who revise their expectations of the level of their replacement rate upwards tend to become more satisfied with their pension provisions, in particular with the level of the expected benefits. We do not find robust evidence for a relationship between uncertainty and pension satisfaction.  相似文献   
69.
This article uses a microstructure approach to analyse the effectiveness of capital controls introduced in Brazil to counter an appreciation of the Real. Based on a rich data set from the Brazilian foreign exchange market, we estimate a reduced-form VAR to characterize the interaction of the central bank, financial and commercial customers in times of regulatory policy measures. We find that capital controls change market participants’ behaviour, and that central bank interventions elicit a significant response in financial order flow. Referring to the source of order flow, we find no direct price impact by financial flows and thus no evidence that the appreciation of the Real is driven by financial customers’ activity. Instead, commercial customers seem to be a primary driver of the Real within our model.  相似文献   
70.
This article investigates the determinants of newspapers’ provision for political opinion. I empirically examine the role of newspapers’ political preferences and market competition on newspapers’ decision to make endorsements. Regression results suggest that market competition turns newspapers more likely to make endorsements. Results from a simple model show that newspapers’ ideology determine their endorsements, making partisan papers more likely to make political recommendations and endorse challengers than non‐partisan newspapers.  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