全文获取类型
收费全文 | 42755篇 |
免费 | 845篇 |
国内免费 | 1篇 |
专业分类
财政金融 | 8174篇 |
工业经济 | 3137篇 |
计划管理 | 7226篇 |
经济学 | 9649篇 |
综合类 | 472篇 |
运输经济 | 238篇 |
旅游经济 | 669篇 |
贸易经济 | 6580篇 |
农业经济 | 2069篇 |
经济概况 | 5241篇 |
邮电经济 | 146篇 |
出版年
2021年 | 238篇 |
2020年 | 418篇 |
2019年 | 566篇 |
2018年 | 753篇 |
2017年 | 796篇 |
2016年 | 745篇 |
2015年 | 552篇 |
2014年 | 856篇 |
2013年 | 4033篇 |
2012年 | 1134篇 |
2011年 | 1206篇 |
2010年 | 1001篇 |
2009年 | 1189篇 |
2008年 | 1169篇 |
2007年 | 1108篇 |
2006年 | 1001篇 |
2005年 | 927篇 |
2004年 | 910篇 |
2003年 | 939篇 |
2002年 | 868篇 |
2001年 | 866篇 |
2000年 | 906篇 |
1999年 | 763篇 |
1998年 | 781篇 |
1997年 | 764篇 |
1996年 | 758篇 |
1995年 | 707篇 |
1994年 | 756篇 |
1993年 | 746篇 |
1992年 | 729篇 |
1991年 | 783篇 |
1990年 | 678篇 |
1989年 | 561篇 |
1988年 | 588篇 |
1987年 | 566篇 |
1986年 | 599篇 |
1985年 | 849篇 |
1984年 | 820篇 |
1983年 | 771篇 |
1982年 | 771篇 |
1981年 | 717篇 |
1980年 | 668篇 |
1979年 | 690篇 |
1978年 | 591篇 |
1977年 | 491篇 |
1976年 | 428篇 |
1975年 | 425篇 |
1974年 | 363篇 |
1973年 | 372篇 |
1972年 | 297篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
In this paper we analyze the properties of price equilibria in a duopoly market where firms sell vertically differentiated products, consumers being uncertain about which firm sells which quality. Both existence and properties of price equilibria are characterized by the beliefs of the consumers' population about the distribution of quality between firms. 相似文献
42.
43.
The price movements of certain assets can be modeled by stochastic processes that combine continuous diffusion with discrete jumps. This paper compares values of options on assets with no jumps, jumps of fixed size, and jumps drawn from a lognormal distribution. It is shown that not only the magnitude but also the direction of the mispricing of the Black-Scholes model relative to jump models can vary with the distribution family of the jump component. This paper also discusses a methodology for the numerical valuation, via a backward induction algorithm, of American options on a jump-diffusion asset whose early exercise may be profitable. These cannot, in general, be accurately priced using analytic models. The procedure has the further advantage of being easily adaptable to nonanalytic, empirical distributions of period returns and to nonstationarity in the underlying diffusion process. 相似文献
44.
45.
Current Issues in the Analysis of Commercial Real Estate 总被引:1,自引:0,他引:1
This paper identifies and discusses a number of current issues regarding our understanding of commercial real estate markets. These issues include: 1) accurate estimation of the quantity and location of our nation's commercial space; 2) an understanding of the linkage between the space and capital markets for commercial real estate; 3) identification of the macroeconomic factors that affect the rate of return on commercial property and whether local market factors also affect the rate of return; 4) problems associated with measuring the return characteristics of equity investments in commercial property (including measures of the diversification benefits and inflation-hedging abilities of this asset class); 5) a better understanding of rental markets, including good measures of changes in effective rents over time; and 6) examination of the rationale for ownership of commercial space by corporate users. This paper reviews recent research related to these questions and suggests future research that should prove to be fruitful. 相似文献
46.
Summary A sequential testing procedure called 2-SPRT for the meanμ of the negative binomial distribution with known exponentk is presented. For any fixedμ
0(μ
1<μ
0<μ
2), the 2-SPRT provides an asymptotic solution to the modified Kiefer-Weiss problem. Determination ofμ
0 such that the test provides an approximate solution to the Kiefer-Weiss problem is described. The behavior of the 2-SPRT
and the Sequential Probability Ratio Test is investigated using Monte Carlo methods. The error probabilities and the average
sample numbers are compared.
All the computations were carried out on the Alabama Supercomputer. 相似文献
47.
48.
Robert J. Hershock Charles D. Cowman Douglas Peters 《Journal of Product Innovation Management》1994,11(2):95-104
A growing awareness of workplace hazards and identification of airborne contaminants, coupled with a changing safety and health regulatory environment, created an unexpected demand for new and innovative respirators in the early 1980s. 3M's Occupational Health and Environmental Safety Division broke new ground by taking the team concept further than ever before in the company. The division's Action Teams successfully designed, built and introduced products in less than half the time it would have taken previously. Robert Hershock, Charles Cowman and Douglas Peters describe how 3M learned important lessons about team selection, training, performance and motivation, the importance of project sponsors, and the role of middle management. 相似文献
49.
Carla J. Robinson 《The Review of Black Political Economy》1991,19(3-4):85-109
Atlanta has the reputation of being a city of opportunity for blacks. However, in Atlanta, as well as in other cities across
the nation, the nexus of racism and economic discrimination has resulted in disparities between the housing status of blacks
and whites. This article examines racial disparities in the Atlanta housing market. It begins by tracing recent trends in
the Atlanta-area economy and by providing background information on the local housing market. It then discusses the roles
of the federal Home Mortgage Disclosure Act of 1975 and Community Reinvestment Act of 1977 in the efforts of local groups
to reduce racial disparities in the housing market. The final section discusses recent local developments that might lead
to improvements in the housing status of black Atlantans. 相似文献
50.
Robert R. Grauer 《The Financial Review》1991,26(4):569-585
This paper employs the optimality conditions for expected utility and mean-variance portfolio problems to examine the ambiguities associated with the security market line criterion both at a point in time and through time. At a point in time, we show that the security market line criterion can be irrelevant, even in meanvariance economies. In a multiperiod setting, we show that the analysis of performance based on portfolio choice is inconsistent with the analysis based on return generating models. Empirical work suggests that the inconsistency can lead to dramatically different estimates of a security's required return. 相似文献