全文获取类型
收费全文 | 24384篇 |
免费 | 505篇 |
专业分类
财政金融 | 4373篇 |
工业经济 | 1734篇 |
计划管理 | 4178篇 |
经济学 | 5781篇 |
综合类 | 262篇 |
运输经济 | 187篇 |
旅游经济 | 361篇 |
贸易经济 | 4017篇 |
农业经济 | 1202篇 |
经济概况 | 2716篇 |
信息产业经济 | 3篇 |
邮电经济 | 75篇 |
出版年
2023年 | 124篇 |
2021年 | 160篇 |
2020年 | 304篇 |
2019年 | 482篇 |
2018年 | 525篇 |
2017年 | 567篇 |
2016年 | 544篇 |
2015年 | 370篇 |
2014年 | 604篇 |
2013年 | 2594篇 |
2012年 | 825篇 |
2011年 | 846篇 |
2010年 | 734篇 |
2009年 | 864篇 |
2008年 | 774篇 |
2007年 | 677篇 |
2006年 | 645篇 |
2005年 | 571篇 |
2004年 | 502篇 |
2003年 | 515篇 |
2002年 | 459篇 |
2001年 | 540篇 |
2000年 | 490篇 |
1999年 | 437篇 |
1998年 | 496篇 |
1997年 | 444篇 |
1996年 | 450篇 |
1995年 | 378篇 |
1994年 | 385篇 |
1993年 | 379篇 |
1992年 | 385篇 |
1991年 | 399篇 |
1990年 | 368篇 |
1989年 | 273篇 |
1988年 | 283篇 |
1987年 | 290篇 |
1986年 | 268篇 |
1985年 | 385篇 |
1984年 | 379篇 |
1983年 | 356篇 |
1982年 | 300篇 |
1981年 | 315篇 |
1980年 | 314篇 |
1979年 | 295篇 |
1978年 | 249篇 |
1977年 | 199篇 |
1976年 | 193篇 |
1975年 | 174篇 |
1974年 | 158篇 |
1973年 | 157篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
A statistically optimal inference about agents' ex ante price expectations within the US broiler market is derived using futures prices of related commodities along with a quasi‐rational forecasting regression equation. The modelling approach, which builds on a Hamilton‐type framework, includes endogenous production and allows expected cash price to be decomposed into anticipated and unanticipated components. We therefore infer the relative importance of various informational sources in expectation formation. Results show that, in addition to the quasi‐rational forecast, the true supply shock, future prices, and ex post commodity price forecast errors have, at times, been influential in broiler producers' price expectations. Copyright © 2003 John Wiley & Sons, Ltd. 相似文献
22.
23.
24.
25.
26.
27.
28.
Timothy M. Devinney 《Journal of Product Innovation Management》1992,9(3):222-231
The historic focus of new products research has been on the ability of new products to enhance the profitability and competitive position of the innovating firm. In this article, Timothy Devinney shows that there exists an overlooked and potentially significant side effect associated with new product innovations: financial risk changes. He reports that significant financial risk changes occurred in approximately 50% of the new product announcements he examined. The magnitude of these financial risk changes translates into overestimates or underestimates of the firm's cost of capital by 17% to 18% and is strongly and positively related to the size of the firm and the firm's new product innovation activity. 相似文献
29.
The purpose of this study was to find out if significant differences exist in patterns of expenditures between elderly and non-elderly consumers, taking poverty status into account. Cluster analysis was used to identify expenditure patterns. Four different expenditure patterns were found. Elderly middle-income and affluent households were more likely to belong to service-using cluster than non-elderly poor households. Nonelderly households were more likely to belong to shelter-dominated cluster than elderly households. Poor households were more likely to belong to homebound cluster, while non-poor households were more likely to belong to car-centred cluster. 相似文献
30.
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