全文获取类型
收费全文 | 16891篇 |
免费 | 445篇 |
专业分类
财政金融 | 3357篇 |
工业经济 | 1603篇 |
计划管理 | 2984篇 |
经济学 | 3510篇 |
综合类 | 161篇 |
运输经济 | 158篇 |
旅游经济 | 302篇 |
贸易经济 | 2797篇 |
农业经济 | 888篇 |
经济概况 | 1569篇 |
信息产业经济 | 1篇 |
邮电经济 | 6篇 |
出版年
2023年 | 90篇 |
2021年 | 129篇 |
2020年 | 242篇 |
2019年 | 349篇 |
2018年 | 387篇 |
2017年 | 390篇 |
2016年 | 394篇 |
2015年 | 267篇 |
2014年 | 430篇 |
2013年 | 1843篇 |
2012年 | 538篇 |
2011年 | 611篇 |
2010年 | 544篇 |
2009年 | 680篇 |
2008年 | 596篇 |
2007年 | 517篇 |
2006年 | 506篇 |
2005年 | 475篇 |
2004年 | 423篇 |
2003年 | 471篇 |
2002年 | 404篇 |
2001年 | 391篇 |
2000年 | 386篇 |
1999年 | 351篇 |
1998年 | 321篇 |
1997年 | 321篇 |
1996年 | 284篇 |
1995年 | 276篇 |
1994年 | 255篇 |
1993年 | 255篇 |
1992年 | 249篇 |
1991年 | 226篇 |
1990年 | 217篇 |
1989年 | 203篇 |
1988年 | 200篇 |
1987年 | 188篇 |
1986年 | 181篇 |
1985年 | 231篇 |
1984年 | 251篇 |
1983年 | 236篇 |
1982年 | 220篇 |
1981年 | 188篇 |
1980年 | 201篇 |
1979年 | 162篇 |
1978年 | 166篇 |
1977年 | 134篇 |
1976年 | 132篇 |
1975年 | 91篇 |
1974年 | 98篇 |
1973年 | 93篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
The use of transferable discharge permits as a water pollution control policy is rapidly increasing in the United States. Drawing on evidence from existing water quality trading programs, this paper provides a taxonomy of the forms that such markets take. Four main structures are identified: exchanges, bilateral negotiations, clearinghouses, and sole-source offsets. Each of these structures has its own strengths and weaknesses; none is optimal for all scenarios. Since market structure is largely determined by a program's rules, policy makers should be aware of the differences between these structures and the conditions under which each comes to be. 相似文献
83.
Summary. This research studies the role of multivariate distribution structures on random asset returns in determining the optimal
allocation vector for an expected utility maximizer. All our conclusions pertain for the set of risk averters. By carefully
disturbing symmetry in the distribution of the, possibly covarying, returns, we ascertain the ordinal structure of the optimized
allocation vector. Rank order of allocations is also established when a permutation symmetric random vector is mapped into
the returns vector through location and scale shifts. It is shown that increased dispersion in the vectors of location and
scale parameters benefit, ex-ante, investors as does a decrease in the rank correlation coefficient between the location and
scale parameter vectors. Revealed preference comparative static results are identified for the location and scale vectors
of asset returns. For most issues addressed, we arrive at much stronger inferences when a safe asset is available.
Received: August 8, 2000; revised version: January 8, 2001 相似文献
84.
The effectiveness of the decision‐making process in appraisal has been of long‐standing interest. This paper reports the results of research exploring the extent to which those undertaking appraisals apply systematic processes to their decision‐making, represented in terms of the cognitive processing models applied by appraisers. Results of 22 cognitive mapping interviews exploring appraisal practice, undertaken with appraisers in the Malaysian education system, are described. The resultant cognitive maps have been explored for what they tell us about the cognitive processing models underlying appraisers' decision‐making. Results suggest that the practice of appraisal evidenced in interviews demonstrates the presence of cognitive processing that reflects theoretical cognitive processing models, although some differences are observed between less experienced and experienced appraisers' models. Implications from the interview findings for the practice of appraisal are identified. 相似文献
85.
David Johnson 《The Australian economic review》2002,35(3):287-289
This article introduces the Policy Forum on funding arrangements between the Commonwealth and the States. 相似文献
86.
This paper gives a tree-based method for pricing American options in models where the stock price follows a general exponential Lévy process. A multinomial model for approximating the stock price process, which can be viewed as generalizing the binomial model of Cox, Ross, and Rubinstein (1979) for geometric Brownian motion, is developed. Under mild conditions, it is proved that the stock price process and the prices of American-type options on the stock, calculated from the multinomial model, converge to the corresponding prices under the continuous time Lévy process model. Explicit illustrations are given for the variance gamma model and the normal inverse Gaussian process when the option is an American put, but the procedure is applicable to a much wider class of derivatives including some path-dependent options. Our approach overcomes some practical difficulties that have previously been encountered when the Lévy process has infinite activity. 相似文献
87.
Does hedging add value to the firm, and if so, is the source of the added value consistent with hedging theory? We investigate jet fuel hedging behavior of firms in the US airline industry during 1992–2003 to examine whether such hedging is a source of value for these companies. We illustrate that the investment and financing climate in the airline industry conforms well to the theoretical framework of Froot, Scharfstein, and Stein (1993). In general, airline industry investment opportunities correlate positively with jet fuel costs, while higher fuel costs are consistent with lower cash flow. Given that jet fuel costs are hedgeable, airlines with a desire for expansion may find value in hedging future purchases of jet fuel. Our results show that jet fuel hedging is positively related to airline firm value. The coefficients on the hedging variables in our regression analysis suggest that the “hedging premium” is greater than the 5% documented in Allayannis and Weston (2001), and might be as large as 10%. We find that the positive relation between hedging and value increases in capital investment, and that most of the hedging premium is attributable to the interaction of hedging with investment. This result is consistent with the assertion that the principal benefit of jet fuel hedging by airlines comes from reduction of underinvestment costs. 相似文献
88.
David C. Hall Thomas O. Knight Keith H. Coble Alan E. Baquet George F. Patrick 《Review of Agricultural Economics》2003,25(2):430-448
Beef cattle producers were surveyed in Texas and Nebraska to investigate perceptions of sources of risk, the effectiveness of risk management strategies, and interest in further risk management education, particularly production risk, using probit analysis. Important decision variables identified are age, prior use of risk management tools, previous attendances of risk management education, and risk aversion. Severe drought and cattle price variability are identified as primary risk factors with potential to affect farm income. Extremely cold weather and disease are of less importance. Understocking pasture and storing hay are perceived most effective as risk management options. 相似文献
89.
By Anthoniew. M. Meijers 《American journal of economics and sociology》2003,62(1):167-183
A BSTRACT . Searle's philosophical construction of social reality has three basic "building blocks": collective intentionality, constitutive rules, and the imposition of functions. This article will focus on the first of these, collective intentionality, which is taken to be the central span on the bridge from physics to society. Searle analyzes this notion in terms of his own internalist theory of intentionality. In his view, we could have all the collective intentionality we have even if we were a brain in a vat, i.e., even if we were radically mistaken about the outside world. It will be argued that such an internalist view of collective intentionality cannot capture normative aspects of social phenomena. Social reality requires a radical relational approach. 相似文献
90.