全文获取类型
收费全文 | 29713篇 |
免费 | 585篇 |
专业分类
财政金融 | 5355篇 |
工业经济 | 2166篇 |
计划管理 | 5058篇 |
经济学 | 6760篇 |
综合类 | 311篇 |
运输经济 | 186篇 |
旅游经济 | 484篇 |
贸易经济 | 4583篇 |
农业经济 | 1424篇 |
经济概况 | 3896篇 |
邮电经济 | 75篇 |
出版年
2021年 | 182篇 |
2020年 | 298篇 |
2019年 | 385篇 |
2018年 | 567篇 |
2017年 | 561篇 |
2016年 | 532篇 |
2015年 | 398篇 |
2014年 | 618篇 |
2013年 | 2906篇 |
2012年 | 807篇 |
2011年 | 864篇 |
2010年 | 696篇 |
2009年 | 823篇 |
2008年 | 868篇 |
2007年 | 772篇 |
2006年 | 713篇 |
2005年 | 660篇 |
2004年 | 663篇 |
2003年 | 650篇 |
2002年 | 608篇 |
2001年 | 612篇 |
2000年 | 608篇 |
1999年 | 522篇 |
1998年 | 534篇 |
1997年 | 506篇 |
1996年 | 510篇 |
1995年 | 455篇 |
1994年 | 504篇 |
1993年 | 508篇 |
1992年 | 478篇 |
1991年 | 503篇 |
1990年 | 455篇 |
1989年 | 378篇 |
1988年 | 388篇 |
1987年 | 383篇 |
1986年 | 395篇 |
1985年 | 570篇 |
1984年 | 532篇 |
1983年 | 533篇 |
1982年 | 516篇 |
1981年 | 446篇 |
1980年 | 439篇 |
1979年 | 449篇 |
1978年 | 382篇 |
1977年 | 344篇 |
1976年 | 274篇 |
1975年 | 268篇 |
1974年 | 251篇 |
1973年 | 238篇 |
1972年 | 196篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
This article analyses the effects of action aimed at narrowing the gap between South Africa's ‘two agricultures’, specifically the effects of the Farmer Support Programme (FSP) on structural aspects of maize production under different marketing policies. This is done by assembling a sectoral linear programming model of the South African summer-rainfall grain-producing area. The emphasis is on the inclusion of supply, demand and production risk. Results show that the effects of a successful FSP on specific interest groups, e.g. consumers of a specific product, or producers in a specific region, depend on the marketing policy followed, as well as on the effectiveness of the FSP. The analysis accentuates the interrelationships in South African crop production and illustrates how past policies ignored regional comparative advantages, distorted regional development and affected social welfare. 相似文献
32.
33.
The influence of lagged adjustment and consumer spending on retail labour productivity is investigated. Both influences result in a procyclical productivity pattern. 相似文献
34.
35.
36.
Clive W. J. Granger 《Oxford bulletin of economics and statistics》2003,65(Z1):689-701
The paper asks the question – as time series analysis moves from consideration of conditional mean values and variances to unconditional distributions, do some of the familiar concepts devised for the first two moments continue to be helpful in the more general area? Most seem to generalize fairly easy, such as the concepts of breaks, seasonality, trends and regime switching. Forecasting is more difficult, as forecasts become distributions, as do forecast errors. Persistence can be defined and also common factors by using the idea of a copula. Aggregation is more difficult but causality and controllability can be defined. The study of the time series of quantiles becomes more relevant. 相似文献
37.
Two of the main forces driving European emigration in the late nineteenth century were real wage gaps between sending and receiving regions and demographic booms in the low‐wage sending regions. Our new estimates of net migration for the countries of sub‐Saharan Africa show that exactly the same forces driving African across‐border migration are at work today. The results suggest that rapid growth in the cohort of potential young emigrants, population pressure on the resource base, and slow economic growth are likely to intensify the pressure for migration out of Africa and into high‐wage OECD countries over the next two decades. 相似文献
38.
39.
40.
American-style Indexed Executive Stock Options 总被引:3,自引:0,他引:3
Peter Løchte Jørgensen 《European Finance Review》2002,6(3):321-358
This paper develops a new pricing model for American-style indexed executive stock options. We rely on a basic model framework and an indexation scheme first proposed by Johnson and Tian (2000a) in their analysis of European-style indexed options. Our derivation of the valuation formula represents an instructive example of the usefulness of the change-of-numeraire technique. In the paper's numerical section we implement the valuation formula and demonstrate that not only may the early exercise premium be significant but also that the delta of the American-style option is typically much larger than the delta of the otherwise identical (value-matched) European-style option. Vega is higher for indexed options than for conventional options but largely independent of whether the options are European- or American-style. This has important implications for the design of executive compensation contracts. We finally extend the analysis to cover the case where the option contracts are subject to delayed vesting. We show that for realistic parameter values, delayed vesting leads only to a moderate reduction in the value of the American-style indexed executive stock option. 相似文献