全文获取类型
收费全文 | 4615篇 |
免费 | 155篇 |
专业分类
财政金融 | 794篇 |
工业经济 | 283篇 |
计划管理 | 766篇 |
经济学 | 1092篇 |
综合类 | 44篇 |
运输经济 | 35篇 |
旅游经济 | 35篇 |
贸易经济 | 743篇 |
农业经济 | 212篇 |
经济概况 | 765篇 |
邮电经济 | 1篇 |
出版年
2023年 | 28篇 |
2021年 | 29篇 |
2020年 | 66篇 |
2019年 | 97篇 |
2018年 | 166篇 |
2017年 | 185篇 |
2016年 | 164篇 |
2015年 | 95篇 |
2014年 | 151篇 |
2013年 | 525篇 |
2012年 | 184篇 |
2011年 | 189篇 |
2010年 | 178篇 |
2009年 | 209篇 |
2008年 | 169篇 |
2007年 | 165篇 |
2006年 | 151篇 |
2005年 | 89篇 |
2004年 | 117篇 |
2003年 | 108篇 |
2002年 | 84篇 |
2001年 | 62篇 |
2000年 | 74篇 |
1999年 | 58篇 |
1998年 | 70篇 |
1997年 | 34篇 |
1996年 | 64篇 |
1995年 | 43篇 |
1994年 | 52篇 |
1993年 | 50篇 |
1992年 | 56篇 |
1991年 | 54篇 |
1990年 | 59篇 |
1989年 | 29篇 |
1988年 | 33篇 |
1987年 | 44篇 |
1986年 | 42篇 |
1985年 | 61篇 |
1984年 | 58篇 |
1983年 | 40篇 |
1982年 | 43篇 |
1981年 | 48篇 |
1980年 | 42篇 |
1979年 | 44篇 |
1978年 | 49篇 |
1977年 | 47篇 |
1976年 | 42篇 |
1975年 | 30篇 |
1974年 | 22篇 |
1969年 | 25篇 |
排序方式: 共有4770条查询结果,搜索用时 914 毫秒
1.
Various aspects of sustainable development and quality of life are considered, including the impact of standardization. Particular attention is paid to the study of the role played by standardization in improving environmental protection. In this connection the significance of standardization is shown as a factor of improving the technological potential of an enterprise and the quality of life. Various approaches to methods for assessing the effective impact of standardization on the quality of life are analyzed. 相似文献
2.
The general consensus in the volatility forecasting literature is that high-frequency volatility models outperform low-frequency volatility models. However, such a conclusion is reached when low-frequency volatility models are estimated from daily returns. Instead, we study this question considering daily, low-frequency volatility estimators based on open, high, low, and close daily prices. Our data sample consists of 18 stock market indices. We find that high-frequency volatility models tend to outperform low-frequency volatility models only for short-term forecasts. As the forecast horizon increases (up to one month), the difference in forecast accuracy becomes statistically indistinguishable for most market indices. To evaluate the practical implications of our results, we study a simple asset allocation problem. The results reveal that asset allocation based on high-frequency volatility model forecasts does not outperform asset allocation based on low-frequency volatility model forecasts. 相似文献
3.
Daniel Hernndez‐Hernndez Harold A. Moreno‐Franco Jos‐Luis Prez 《Mathematical Finance》2019,29(4):1039-1065
We study the optimal execution problem with multiplicative price impact in algorithmic trading, when an agent holds an initial position of shares of a financial asset. The interselling decision times are modeled by the arrival times of a Poisson process. The criterion to be optimized consists in maximizing the expected net present value of the gains of the agent, and it is proved that an optimal strategy has a barrier form, depending only on the number of shares left and the level of the asset price. 相似文献
4.
Gary V. Engelhardt Michael D. Eriksen Nadia Greenhalgh‐Stanley 《Real Estate Economics》2019,47(4):1055-1088
We examine the extent to which parents use housing and shared living arrangements as a form of risk‐sharing for their adult children, using detailed data on children and parents in the Health and Retirement Study for 1998–2012. On average, a young man moving from full‐time to nonemployment raises the likelihood of coresiding with a parent by 1.5 percentage points; moving from full‐time employment to being part‐time employed raises the likelihood of coresiding with a parent by 2 percentage points. The implied elasticity of parental coresidence with respect to the son's income is ‐1.1; for daughters, the elasticity is ‐0.5. 相似文献
5.
I examine the effect of reform on telecom performance using a second-generation regulatory framework index and panel data techniques to test how regulatory governance affected sector performance in 22 Latin American countries during the period 1980–1997. Sound regulatory governance in telecommunications has a positive impact on network expansion and efficiency, in both the static and dynamic specifications. Openness of markets to competition and divestment of former state-owned telco operators also contributed positively to better sector performance. The dynamic specification shows that past performance has its own strong effect on present (and perhaps future) performance. 相似文献
6.
The performance of service industries in Canada has been lower than that of good industries over the last four decades, with noticeable exceptions such as for railways and telecommunication carriers. Service industries were less economically (and technically) efficient in that they generated less output value (quantity) per hour worked (level and growth) or per combined unit of labour and capital (multifactor productivity growth) than good industries. The relative output price of services declined slightly over time compared with goods. At the disaggregated level, changing relative output prices were substantial and proved to be an important factor explaining the relative satisfactory economic performance of many service industries despite their low technical performance. Nevertheless, the output share of service industries increased over that period, sustained, mainly, by the growing recourse of all firms to outsourcing of services. 相似文献
7.
Luis Ubeda 《Economic Theory》2003,23(1):195
Summary. Although not assumed explicitly, we show that neutrality plays an important role in Arrow and other impossibility theorems. Applying it to pivotal voters we produce direct proofs of classical impossibility theorems, including Arrow's, as well as extend some of these theorems. We further explore the role of neutrality showing that it is equivalent to Pareto or reverse Pareto, and to effective dictatorship for non-null social welfare functions satisfying the principle of independence of irrelevant alternatives. It is also equivalent to Wilson's Citizens' Sovereignty--which is related to the intuition that symmetry over alternatives makes social preference depend only on citizens' preferences. We show that some of these results are more fundamental than others in that they extend both to infinite societies and to considerably smaller domains of preferences. Finally, as an application of Arrow's theorem, we provide a simple proof of the Gibbard-Satterthwaite theorem.Received: 13 April 2000, Revised: 6 December 2002, JEL Classification Numbers:
D71, C70.I thank Salvador Barberá, Luis Corchón, Cesar Martinelli, Eric Maskin, Tomas Sjöström, Ricard Torres, José Pedro Ubeda, and an anonymous referee for feedback. The proofs of Arrow's theorem and two Wilson's theorems come from a note I wrote in 1987 at Universitat Autónoma de Barcelona (Ubeda [16]). In 1996 Geanakoplos [7] wrote a proof of Arrow's theorem similar but not identical to mine. All work in this paper is independent of his. 相似文献
8.
Price V. Fishback Shawn Kantor John Joseph Wallis 《Explorations in Economic History》2003,40(3):278-307
We examine the importance of Roosevelt’s “relief, recovery, and reform” motives to the distribution of New Deal funds across over 3000 US counties, program by program. The major relief programs most closely followed Roosevelt’s three Rs. Other programs were tilted more in favor of areas with higher incomes. For all programs spending for political advantage in upcoming elections was a significant factor. Roosevelt’s successful reelections were based on developing specific programs for a broad range of constituents, delivering on his stated goals, but also spending more at the margin for political purposes. 相似文献
9.
A. S. Nekrasov S. A. Voronina V. V. Semikashev 《Studies on Russian Economic Development》2008,19(2):136-144
The current progress of electrification in Russia is clearly insufficient compared with G8 countries. At the same time, economy sectors have a high potential for energy saving. The electricity consumption of households depends on their cash income and the growth rate of electricity tariffs. 相似文献
10.