全文获取类型
收费全文 | 41322篇 |
免费 | 512篇 |
国内免费 | 1篇 |
专业分类
财政金融 | 7347篇 |
工业经济 | 2552篇 |
计划管理 | 6273篇 |
经济学 | 9178篇 |
综合类 | 829篇 |
运输经济 | 229篇 |
旅游经济 | 484篇 |
贸易经济 | 8122篇 |
农业经济 | 1355篇 |
经济概况 | 4795篇 |
信息产业经济 | 44篇 |
邮电经济 | 627篇 |
出版年
2021年 | 146篇 |
2020年 | 269篇 |
2019年 | 449篇 |
2018年 | 2724篇 |
2017年 | 2522篇 |
2016年 | 1693篇 |
2015年 | 393篇 |
2014年 | 653篇 |
2013年 | 2640篇 |
2012年 | 1184篇 |
2011年 | 2685篇 |
2010年 | 2436篇 |
2009年 | 2226篇 |
2008年 | 2206篇 |
2007年 | 2446篇 |
2006年 | 669篇 |
2005年 | 887篇 |
2004年 | 993篇 |
2003年 | 1024篇 |
2002年 | 780篇 |
2001年 | 540篇 |
2000年 | 535篇 |
1999年 | 468篇 |
1998年 | 446篇 |
1997年 | 439篇 |
1996年 | 447篇 |
1995年 | 371篇 |
1994年 | 387篇 |
1993年 | 424篇 |
1992年 | 423篇 |
1991年 | 412篇 |
1990年 | 339篇 |
1989年 | 317篇 |
1988年 | 306篇 |
1987年 | 321篇 |
1986年 | 335篇 |
1985年 | 488篇 |
1984年 | 450篇 |
1983年 | 415篇 |
1982年 | 390篇 |
1981年 | 355篇 |
1980年 | 398篇 |
1979年 | 322篇 |
1978年 | 277篇 |
1977年 | 262篇 |
1976年 | 207篇 |
1975年 | 244篇 |
1974年 | 199篇 |
1973年 | 196篇 |
1972年 | 134篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
41.
42.
This paper investigates whether governments can change market structures through interventions. We study the effects of four political events over the life cycle of the market for daily newspapers in the Netherlands. We find that policy measures meant to lower entry barriers in an expanding industry created new entry and increased survival chances for potential entrants and incumbent newspapers. Exit barrier enhancing policies to reduce concentration tendencies have not been successful. 相似文献
43.
Recently, much of the research into the relation between market values and accounting numbers has used, or at least made reference to, the residual income model (RIM). Two basic types of empirical research have developed. The “historical” type explores the relation between market values and reported accounting numbers, often using the linear dynamics in Ohlson 1995 and Feltham and Ohlson 1995 and 1996. The “forecast” type explores the relation between market value and the present value of the book value of equity, a truncated sequence of residual income forecasts, and an estimate of the terminal value at the truncation date. The analysis in this paper integrates these two approaches. We expand the Feltham and Ohlson 1996 model by including one‐ and two‐period‐ahead residual income forecasts to infer “other” information regarding future revenues from past investments and future growth opportunities. This approach results in a model in which the difference between market value and book value of equity is a function of current residual income, one‐ and two‐period‐ahead residual income, current capital investment, and start‐of‐period operating assets. The existence of both persistence in revenues from current and prior investments and growth in future positive net present value investment opportunities leads us to hypothesize a negative coefficient on the one‐period‐ahead residual income forecast and a positive coefficient on the two‐period‐ahead residual income forecast. Our empirical results strongly support our hypotheses with respect to the forecast coefficients. 相似文献
44.
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
45.
46.
A. A. Smith 《Journal of Applied Econometrics》1993,8(Z1):S63-S84
This paper develops two new methods for conducting formal statistical inference in nonlinear dynamic economic models. The two methods require very little analytical tractability, relying instead on numerical simulation of the model's dynamic behaviour. Although one of the estimators is asymptotically more efficient than the other, a Monte Carlo study shows that, for a specific application, the less efficient estimator has smaller mean squared error in samples of the size typically encountered in macroeconomics. The estimator with superior small sample performance is used to estimate the parameters of a real business cycle model using observed US time-series data. 相似文献
47.
Abstract. We experimentally investigate the effects of a mandatory increase in education on the market for professional labor services when several service qualities are assumed to exist. We show that when suppliers have insufficient incentives to offer high-quality services in a free market, an increase in mandatory education can improve the coordination of supplier decisions and increase efficiency. If suppliers voluntarily provide a sufficient quantity of high-quality services, an education constraint can have the opposite effect. In both instances, however, an increase in the mandatory level of education can be expected to reduce the price of high-quality services while increasing the price of lower service qualities. Résumé. Les auteurs ont procédé à une analyse expérimentale des conséquences qu'aurait une hausse imposée du niveau d'études sur le marché des services professionnels, si l'on suppose l'existence de plusieurs qualités de services. L'analyse démontre que lorsque les stimulants sont insuffisants pour inciter les fournisseurs à offrir des services professionnels de qualité supérieure dans un marché libre, une hausse imposée du niveau d'études peut améliorer la coordination des décisions des fournisseurs et augmenter l'efficience. Si toutefois les fournisseurs offrent de leur propre chef une quantité suffisante de services de qualité supérieure, le fait d'imposer un niveau d'études supérieur peut avoir l'effet contraire. Dans les deux cas, on peut s'attendre à ce qu'une hausse du niveau d'études obligatoire réduise le prix des services de qualité supérieure tout en augmentant le prix des services de qualité plus faible. 相似文献
48.
In this paper we investigate the effect of golden parachute (GP) adoptions on shareholder wealth. We control for the potential effect a GP adoption has on the probability that a firm will receive a takeover bid by investigating the wealth effects for firms that are in play when the GP is adopted. We find that announcements are wealth neutral when firms are in play and wealth increasing when firms are not in play when a GP is adopted. The results suggest that GPs have no influence on the success of a tender offer, refuting the hypotheses that they either align manager and shareholder interests or that they entrench inefficient managers. The difference in the results for in-play and not-in-play firms is consistent with the hypothesis that GPs signal an increased likelihood that a firm will receive a takeover bid. 相似文献
49.
50.