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   27794篇
  免费   708篇
  国内免费   5篇
财政金融   4030篇
工业经济   1609篇
计划管理   3922篇
经济学   5383篇
综合类   244篇
运输经济   176篇
旅游经济   341篇
贸易经济   3768篇
农业经济   1140篇
经济概况   2595篇
水利工程   5222篇
信息产业经济   3篇
邮电经济   74篇
  2021年   222篇
  2020年   337篇
  2019年   537篇
  2018年   655篇
  2017年   658篇
  2016年   679篇
  2015年   447篇
  2014年   685篇
  2013年   2635篇
  2012年   1101篇
  2011年   1057篇
  2010年   802篇
  2009年   873篇
  2008年   937篇
  2007年   958篇
  2006年   952篇
  2005年   818篇
  2004年   760篇
  2003年   538篇
  2002年   486篇
  2001年   577篇
  2000年   494篇
  1999年   469篇
  1998年   512篇
  1997年   474篇
  1996年   469篇
  1995年   411篇
  1994年   406篇
  1993年   395篇
  1992年   410篇
  1991年   425篇
  1990年   384篇
  1989年   303篇
  1988年   318篇
  1987年   316篇
  1986年   284篇
  1985年   402篇
  1984年   394篇
  1983年   370篇
  1982年   330篇
  1981年   330篇
  1980年   352篇
  1979年   331篇
  1978年   284篇
  1977年   231篇
  1976年   249篇
  1975年   206篇
  1974年   202篇
  1973年   202篇
  1972年   152篇
排序方式: 共有10000条查询结果,搜索用时 13 毫秒
961.
The organic dairy category is one of the fastest growing categories of organic foods in the US. Organic milk consumers generally cite perceived health benefits and lower risk of food contamination, as well as perceived superior quality and environmental sustainability of organic farming methods, as the major motivations for preference of organic over conventional milk. While the attributes of organic milk that are valued by consumers are fairly well-known, more ambiguity exists regarding the demographic characteristics of the typical organic milk consumer. This research makes use of experimental data from 148 adult participants and use a Classification and Regression Tree (CART) analysis, a nonparametric modelling approach, to identify how Willingness-to-Pay (WTP) for organic milk varies with the demographic profile of experiment participants. The study finds that perceived taste of organic milk, concern for the risk of consuming conventional milk, being a primary shopper, and the quantity of milk consumed are the major factors that separate experiment participants into groups with high and low WTP for organic milk.  相似文献   
962.
This article examines the impact of the important, yet little studied, state-level antitrust enforcement activity on entry and relocation behaviour by small US firms. Feinberg and Husted (2011) have shown that this enforcement, especially nonhorizontal cases, may be viewed by potential entrants as a negative aspect of the state business climate. However, they did not pursue a more disaggregate analysis of small firm entry behaviour; nor did they investigate different responses between manufacturing, wholesaling and retailing firms. Another related issue is the extent to which state cases filed in tandem with federal investigations have the same impact on establishment entry as do purely ‘independent’ cases. These considerations are dealt with in this article. The author uses annual state-level data from the Statistics of US Business to examine entry and relocation reactions to state antitrust enforcement by firms within three small-business categories: 1–19 employees; 20–99 employees; 100–499 employees. Generally speaking, the smallest retail and wholesale firms seem to favour vigorous antitrust activity, especially enforcement targeted against cartel behaviour by suppliers. The largest small-firm retailers and wholesalers (those with 100–499 employees) seem somewhat threatened by such activity, especially the more controversial nonhorizontal enforcement. However, it must be acknowledged that the effects on entry or relocation of small firms – both positive and negative – are quite small.  相似文献   
963.
Exploring the determinants and dynamics of the current account balance is one of the priorities of academic literature and policy circles. Although the effects of structural variables are deeply analysed, a lesser attention has been paid to the impact of financial variables. Drawing on standard empirical current account models and with a large sample of industrial and developing countries, we report a significant deterioration in the current account balance in case of an increase in the credit growth. Moreover, we find that this link is substantially stronger for the developing ones motivating a closer examination. Therefore, we further advance our analysis and show that credit growth causes a stronger impact on the current account balance for lower levels of financial depth. In other words, at the early stages of financial development, acceleration in the credit growth might cause a larger deterioration in the current account balance; thus, it might be suggested that monetary policy and macro-prudential measures aimed at preventing financial excess might be more effective to reduce the external imbalances at the early stages of financial deepening.  相似文献   
964.
In the 15 years since publication of the book Moneyball: The Art of Winning an Unfair Game in 2003, major-league baseball (MLB) has seen the embrace of analytics by both fans and teams. Using 45 seasons of MLB data, since the introduction of the designated-hitter in the American League in 1973, the present study validates the central premise in Moneyball regarding the importance of certain performance metrics, such as on-base percentage (OBP). The terms in our empirical model are constructed such that our results permit a straightforward comparison of the relative contribution of each factor towards MLB teams’ success in winning games. We also provide evidence indicating that MLB teams have moved to align their payrolls with Moneyball analytics in the years following the book’s publication.  相似文献   
965.
The purpose of this paper is to develop and test a model of the promotional expenditure decision for a firm operating under conditions of combined uncertainty and oligopoly. The uncertainty is assumed to exist in respect of the impact of any particular level of promotional expenditure upon the demand conditions facing the firm.

The analysis forms part of a wider study of advertising by confectionery manufacturers and arose largely as a result of conversations with advertising executives in the confectionery market. In the course of these discussions it became clear that the existing body of theory concerning the promotional expenditure decision is almost completely incapable of accommodating the extensive uncertainty which is an integral part of the promotional decision in a market such as that under consideration. It also became clear (at least in the case of the confectionery market) (a) that decision makers regard the pricing and promotional expenditure decisions as being largely independent and (b) that in a large number of cases decision makers think in terms of a minimum or ‘threshold’ level of promotional expenditure. While these factors are predominantly in the nature of impressionistic informal observations and therefore of doubtful validity as bases for a scientific enquiry, it was nonetheless felt worthwhile to attempt to develop a theoretical framework capable of accommodating them.

While exhibiting considerable indeterminacy, the model developed below at least takes explicit cognisance of risk and uncertainty. It is also formulated in such a way that the promotional and pricing decisions are independent. It is rather remarkable and most encouraging that the analysis appears to predict something closely akin to minimum ‘threshold’ levels of advertising expenditure. Our theoretical exercise might therefore be afforded the minimal justification of providing a framework capable of accommodating the various results of introspection and conversational empiricism.  相似文献   
966.
967.
This paper is an attempt to determine the relationship between the pattern of growth of demand for consumer goods and the market behaviour of the firms selling them, particularly their advertising expenditures. The demand for many consumer goods may not witness a steady growth over time. Firms selling such products will have a market behaviour that differs in character and path from that of those selling in expending markets. In this article, I intend to analyse the market behaviour of firms producing toilet soap in the Australian economy.  相似文献   
968.
969.
Abstract

Aims: This trial-based economic evaluation (EE) assesses from a societal perspective the cost-effectiveness of an intensive 3-day cognitive theory-based intervention (CDT), compared to care-as-usual, in patients with relapsing remitting multiple sclerosis (RRMS) and low disability (Expanded Disability Status Scale [EDDS] score < 4.0).

Materials and methods: The trial of the EE was registered in the Dutch Trial Register: Trial NL5158 (NTR5298). The incremental cost-effectiveness ratio (ICER) was expressed in cost on the Control sub-scale of the Multiple Sclerosis Self-Efficacy Scale (MSSES) and the incremental cost-utility ratio (ICUR) in the cost per Quality Adjusted Life Years (QALY) using the EQ-5D-5L. Bootstrap, sensitivity, and sub-group analyses were performed to determine the robustness of the findings.

Results: The two groups of 79 patients were similar in baseline characteristics. The base case ICER is situated in the northeast quadrant (€72 (40.74/€2,948)) due to a higher MSSES Control score and higher societal costs in the CDT group. The ICUR is situated in the northwest (inferior) quadrant due to losses in QALY and higher societal costs for the CDT group (?0.02/€2,948). Overall, bootstrap, sensitivity, and sub-group analyses confirm the base case findings. However, when the SF-6D is used as a study outcome, there is a high probability that the ICUR is situated in the northeast quadrant.

Limitations: The relative short follow-up time (6?months) and the unexpected increase in MSSES Control in the control group.

Conclusions: When using the EQ-5D-5L to calculate a QALY, CDT is not a cost-effective alternative in comparison to care as usual. However, when using self-efficacy or SF-6D as outcomes, there is a probability that CDT is cost-effective. Based on the current results, CDT for patients with RRMS clearly show its potential. However, an extended follow-up for the economic evaluation is warranted before a final decision on implementation can be made.  相似文献   
970.
Review     
Peter Young & Paul Reynolds, The Amnesia of Reform. A Review of Post‐Communist Privatization. London: Adam Smith Research Trust, 1994, 40 pp., p/b.

Michael Kaser, Privatization in the CIS. London: Royal Institute of International Affairs, 1995, 62 pp., p/b.  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