全文获取类型
收费全文 | 22132篇 |
免费 | 707篇 |
国内免费 | 3篇 |
专业分类
财政金融 | 4169篇 |
工业经济 | 1851篇 |
计划管理 | 4021篇 |
经济学 | 4683篇 |
综合类 | 317篇 |
运输经济 | 178篇 |
旅游经济 | 348篇 |
贸易经济 | 4037篇 |
农业经济 | 961篇 |
经济概况 | 2106篇 |
信息产业经济 | 1篇 |
邮电经济 | 170篇 |
出版年
2023年 | 123篇 |
2021年 | 158篇 |
2020年 | 309篇 |
2019年 | 410篇 |
2018年 | 571篇 |
2017年 | 602篇 |
2016年 | 581篇 |
2015年 | 423篇 |
2014年 | 586篇 |
2013年 | 2307篇 |
2012年 | 762篇 |
2011年 | 757篇 |
2010年 | 708篇 |
2009年 | 792篇 |
2008年 | 779篇 |
2007年 | 659篇 |
2006年 | 632篇 |
2005年 | 587篇 |
2004年 | 517篇 |
2003年 | 550篇 |
2002年 | 488篇 |
2001年 | 481篇 |
2000年 | 471篇 |
1999年 | 404篇 |
1998年 | 388篇 |
1997年 | 421篇 |
1996年 | 362篇 |
1995年 | 364篇 |
1994年 | 328篇 |
1993年 | 338篇 |
1992年 | 341篇 |
1991年 | 320篇 |
1990年 | 279篇 |
1989年 | 266篇 |
1988年 | 229篇 |
1987年 | 236篇 |
1986年 | 221篇 |
1985年 | 321篇 |
1984年 | 322篇 |
1983年 | 319篇 |
1982年 | 267篇 |
1981年 | 273篇 |
1980年 | 248篇 |
1979年 | 254篇 |
1978年 | 212篇 |
1977年 | 196篇 |
1976年 | 207篇 |
1975年 | 160篇 |
1974年 | 165篇 |
1973年 | 142篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
In applications of expected utility analysis, researchers are confronted with a choice among several utility functional forms. Subjective utility values and probability distributions for price and yield were elicited from Sri Lankan producers of minor export crops. Exponential quadratic and cubic utility functions were estimated. The choice of functional form was found to affect both the classification of risk attitudes and the prediction of harvesting strategy. The exponential function was the best predictor of harvesting strategy because it was the best predictor of mature harvesting. All three functions were equally poor predictors of premature harvesting. 相似文献
102.
103.
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
104.
This article estimates economies of scale for a sample of five cellular telephony firms in the United States. We reject constant returns to scale for all but the smallest firm studied; the remaining firms exhibit decreasing returns to scale. This finding suggests that scale economies cannot be used to justify the current regulated duopoly structure of United States cellular markets. 相似文献
105.
To compensate for low civil service incomes, most lecturers at Indonesia's public universities hold one or more other jobs. The career path of the typical lecturer is away from teaching: the higher the classification the greater is the number of outside jobs and the smaller is the time devoted to undergraduate teaching. In effect, public universities cannot now compete for the time of their lecturers. Indonesia has been attempting to increase the quality of undergraduate education by investing in further education of lecturers. Our findings show that such efforts will be futile unless concomitant changes are also made on the demand side. 相似文献
106.
107.
108.
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
109.
110.
David C. Ling 《Real Estate Economics》1993,21(1):47-67
This paper empirically tests valuation models for the mortgage-backed futures-options contracts that traded on the Chicago Board of Trade (CBOT) from June of 1989 until March of 1992. A simple contingent-claim model is shown to produce call option values on mortgage-backed futures (MBF) contracts that are unbiased estimates of actual futures-options prices. The ability of the MBF contract to hedge positions in current coupon Government National Mortgage Association (GNMA) securities relative to the effectiveness of cross-hedging GNMA positions with T-note and T-bond futures contracts is also examined. 相似文献