全文获取类型
收费全文 | 12996篇 |
免费 | 454篇 |
专业分类
财政金融 | 2611篇 |
工业经济 | 1167篇 |
计划管理 | 2304篇 |
经济学 | 2700篇 |
综合类 | 131篇 |
运输经济 | 141篇 |
旅游经济 | 239篇 |
贸易经济 | 2164篇 |
农业经济 | 712篇 |
经济概况 | 1277篇 |
信息产业经济 | 1篇 |
邮电经济 | 3篇 |
出版年
2023年 | 71篇 |
2021年 | 108篇 |
2020年 | 202篇 |
2019年 | 281篇 |
2018年 | 310篇 |
2017年 | 332篇 |
2016年 | 324篇 |
2015年 | 220篇 |
2014年 | 355篇 |
2013年 | 1564篇 |
2012年 | 419篇 |
2011年 | 481篇 |
2010年 | 411篇 |
2009年 | 495篇 |
2008年 | 496篇 |
2007年 | 432篇 |
2006年 | 411篇 |
2005年 | 355篇 |
2004年 | 336篇 |
2003年 | 359篇 |
2002年 | 323篇 |
2001年 | 287篇 |
2000年 | 282篇 |
1999年 | 258篇 |
1998年 | 238篇 |
1997年 | 253篇 |
1996年 | 206篇 |
1995年 | 205篇 |
1994年 | 202篇 |
1993年 | 190篇 |
1992年 | 174篇 |
1991年 | 162篇 |
1990年 | 159篇 |
1989年 | 139篇 |
1988年 | 136篇 |
1987年 | 140篇 |
1986年 | 105篇 |
1985年 | 178篇 |
1984年 | 193篇 |
1983年 | 172篇 |
1982年 | 174篇 |
1981年 | 133篇 |
1980年 | 147篇 |
1979年 | 130篇 |
1978年 | 117篇 |
1977年 | 100篇 |
1976年 | 100篇 |
1975年 | 72篇 |
1974年 | 77篇 |
1973年 | 78篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Control groups can provide counterfactual evidence for assessing the impact of an event or policy change on a target variable. We argue that fitting a multivariate time series model offers potential gains over a direct comparison between the target and a weighted average of controls. More importantly, it highlights the assumptions underlying methods such as difference in differences and synthetic control, suggesting ways to test these assumptions. Gains from simple and transparent time series models are analysed using examples from the literature, including the California smoking law of 1989 and German reunification. We argue that selecting controls using a time series strategy is preferable to existing data‐driven regression methods. 相似文献
2.
I. E. Ilina E. N. Zharova S. P. Burlankov 《Studies on Russian Economic Development》2018,29(2):207-213
This paper presents an approach to assessing the efficacy of public spending on research and development in state programs. At present, there is a need to develop a unified approach to the analysis and evaluation of the efficacy of such spending from the perspective of participants in state programs (federal executive bodies). The proposed approach does not allow evaluating the efficacy of public spending on the development of research areas assigned to the authors. 相似文献
3.
Sequels have become a profitable strategy in the U.S. motion picture industry because of their strong name recognition. However, while the established positioning of a sequel may help insulate it from competing firms' advertising messages, its familiarity may cause moviegoers to be more easily satiated with advertising from the sequel. Therefore, this study examines how sequels differ from original concept movies in terms of their ad effectiveness. We focus our analysis on pre-launch periods, given these periods' importance in shaping the financial outcomes of motion pictures. We consider the weekly online search volume of a movie as a measure of consumer interest in it, and thus as an intermediate response to pre-launch advertising. We then develop a model that assumes ad effectiveness can decline, due to copy and repetition wearout, and increase, due to forgetting, over time. We find that copy wearout is greater for original movies, while repetition wearout and forgetting are greater for sequels. These findings suggest that sequels should allocate more in early pre-launch periods and less immediately before release, relative to originals, to maximize pre-launch consumer interest. 相似文献
4.
Quality & Quantity - Many ecological- and individual-level analyses of voting behaviour use multiple regressions with a considerable number of independent variables but few discussions of their... 相似文献
5.
6.
7.
Gregory Brown Robert Harris Wendy Hu Tim Jenkinson Steven N. Kaplan David T. Robinson 《Journal of Financial Economics》2021,139(2):561-577
Private equity performance, both for buyouts and venture capital, has been highly cyclical: periods of high fundraising have been followed by periods of low performance. Despite this seemingly predictable variation, we find modest gains, at best, to pursuing realistic, investable strategies that time capital commitments to private equity. This occurs, in part, because investors can only time their commitments to funds; they cannot time when commitments are called or when investments are exited. There is a high degree of time-series correlation in net cash flows even across commitment strategies that allocate capital in a very different manner over time. 相似文献
8.
This paper investigates not only the question of whether there is exchange rate pass‐through (ERPT) but also the extent to which the pass‐through is asymmetric or state‐dependent in the BRICS countries. Using monthly data from 1999:M1 to 2019:M12 and non‐linear smooth transition vector autoregressive (STVAR) model, our results provide evidence of period‐specific ERPT between the upper and lower regime periods, governed by the selected transition variables. The results further suggest that the pass‐through of exchange rate is higher when the economy is experiencing large appreciations and expansions as well as large depreciations and recessions. Theimplication for these findings is that ERPT is strongly affected by the state of the economy. 相似文献
9.
10.
Journal of Business Ethics - Airline pilots are attributed ultimate responsibility and final authority over their aircraft to ensure the safety and well-being of all its occupants. Yet, with the... 相似文献