全文获取类型
收费全文 | 24066篇 |
免费 | 523篇 |
国内免费 | 1篇 |
专业分类
财政金融 | 4605篇 |
工业经济 | 1712篇 |
计划管理 | 3575篇 |
经济学 | 5292篇 |
综合类 | 380篇 |
运输经济 | 176篇 |
旅游经济 | 435篇 |
贸易经济 | 3669篇 |
农业经济 | 1257篇 |
经济概况 | 3432篇 |
信息产业经济 | 1篇 |
邮电经济 | 56篇 |
出版年
2021年 | 136篇 |
2020年 | 248篇 |
2019年 | 410篇 |
2018年 | 494篇 |
2017年 | 503篇 |
2016年 | 515篇 |
2015年 | 289篇 |
2014年 | 530篇 |
2013年 | 2456篇 |
2012年 | 716篇 |
2011年 | 802篇 |
2010年 | 670篇 |
2009年 | 750篇 |
2008年 | 722篇 |
2007年 | 627篇 |
2006年 | 567篇 |
2005年 | 479篇 |
2004年 | 506篇 |
2003年 | 453篇 |
2002年 | 505篇 |
2001年 | 440篇 |
2000年 | 457篇 |
1999年 | 436篇 |
1998年 | 407篇 |
1997年 | 421篇 |
1996年 | 414篇 |
1995年 | 359篇 |
1994年 | 367篇 |
1993年 | 399篇 |
1992年 | 411篇 |
1991年 | 402篇 |
1990年 | 330篇 |
1989年 | 301篇 |
1988年 | 292篇 |
1987年 | 302篇 |
1986年 | 309篇 |
1985年 | 469篇 |
1984年 | 433篇 |
1983年 | 401篇 |
1982年 | 377篇 |
1981年 | 347篇 |
1980年 | 390篇 |
1979年 | 319篇 |
1978年 | 271篇 |
1977年 | 257篇 |
1976年 | 199篇 |
1975年 | 243篇 |
1974年 | 194篇 |
1973年 | 190篇 |
1972年 | 133篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
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
83.
This study investigates the relative roles of bond ratings and financial information in the setting of bond yields. Structural equation modeling techniques are used to learn whether ratings determine yields or whether both ratings and yields are determined by a concurrent set of economic and financial factors. Tests of alternative structural model configurations provide evidence regarding the associations between bond ratings, financial information, and bond yields. Both ratings and financial information are found to play an important role in determining bond yields. In addition, yields are consistent with the higher rating in cases of split ratings. 相似文献
84.
This article presents the results of a questionnaire survey sent to a sample of automobile manufacturers in the United States and Japan (including Japanese-managed plants in the United States) during the spring of 1990. The data support observations that Japanese and U.S. practices tend to differ in key areas and Japanese suppliers perform better in dimensions such as quality (defects) and prices (meeting targets, reducing prices over time); and that Japanese-managed auto plants established in the United States have, in general, adopted Japanese practices and receive extremely high levels of quality from Japanese as well as U.S. suppliers. These findings provide evidence that Japanese practices and performance levels are transferable outside Japan and suggest that considerable improvements are possible for U.S. suppliers supplying U.S. auto plants. In addition, the survey indicates that U.S. firms have adopted at least some practices traditionally associated with Japanese firms, apparently reflecting some convergence toward Japanese practices and higher performance levels in supplier management. 相似文献
85.
86.
87.
J. A. L. Cranfield 《Revue canadienne d'agroeconomie》2003,51(3):299-321
Optimal investment rules are developed for a producer agency investing in domestic-market generic advertising, export market promotion, and cost-of-production-reducing research. These rules are derived assuming either maximization of producers' surplus or social surplus. The form of the optimality rules differs according to which objective is pursued. Fixed producer agency budgets are also allowed by incorporating a constraint limiting total expenditure on the three activities. Addition of such a constraint substantially alters the structure of the optimal investment rules. Differences in these rules highlight the importance of accounting for the financing mechanism when modeling optimal checkoff fund investment decisions. Optimality rules are simulated using data for the Canadian beef sector. Results suggest historic underinvestment in domestic-market generic advertising but overinvestment in export market promotion. Sensitivity of simulation results underscores the difficulty in assessing optimality of historic producer investment in cost-of-production-reducing research. 相似文献
88.
This paper analyzes the dynamic relationship between primary and secondary mortgage markets and the short-term and long-term market interest rates. Using a series of monthly data on fixed rate mortgage rates and GNMA rates, we explore the dependence and speed of adjustment in these primary and secondary mortgage rates to each other as well as to the long and short-term government rates. The results indicate that residential mortgage rates in general, appear to follow the long-term rate and are not very sensitive to movements in the short-term interest rate. 相似文献
89.
90.