全文获取类型
收费全文 | 20542篇 |
免费 | 417篇 |
专业分类
财政金融 | 4076篇 |
工业经济 | 1649篇 |
计划管理 | 3234篇 |
经济学 | 4375篇 |
综合类 | 282篇 |
运输经济 | 123篇 |
旅游经济 | 306篇 |
贸易经济 | 3170篇 |
农业经济 | 987篇 |
经济概况 | 2736篇 |
信息产业经济 | 2篇 |
邮电经济 | 19篇 |
出版年
2020年 | 183篇 |
2019年 | 272篇 |
2018年 | 343篇 |
2017年 | 348篇 |
2016年 | 318篇 |
2015年 | 229篇 |
2014年 | 316篇 |
2013年 | 2054篇 |
2012年 | 478篇 |
2011年 | 552篇 |
2010年 | 504篇 |
2009年 | 556篇 |
2008年 | 536篇 |
2007年 | 435篇 |
2006年 | 434篇 |
2005年 | 444篇 |
2004年 | 401篇 |
2003年 | 420篇 |
2002年 | 376篇 |
2001年 | 403篇 |
2000年 | 382篇 |
1999年 | 384篇 |
1998年 | 382篇 |
1997年 | 382篇 |
1996年 | 393篇 |
1995年 | 348篇 |
1994年 | 345篇 |
1993年 | 325篇 |
1992年 | 372篇 |
1991年 | 376篇 |
1990年 | 310篇 |
1989年 | 274篇 |
1988年 | 259篇 |
1987年 | 237篇 |
1986年 | 298篇 |
1985年 | 405篇 |
1984年 | 383篇 |
1983年 | 406篇 |
1982年 | 353篇 |
1981年 | 343篇 |
1980年 | 329篇 |
1979年 | 329篇 |
1978年 | 274篇 |
1977年 | 261篇 |
1976年 | 232篇 |
1975年 | 230篇 |
1974年 | 208篇 |
1973年 | 165篇 |
1972年 | 153篇 |
1971年 | 144篇 |
排序方式: 共有10000条查询结果,搜索用时 78 毫秒
101.
There is ongoing debate about the apparent weak or negative relation between risk (conditional variance) and expected returns in the aggregate stock market. We develop and estimate an empirical model based on the intertemporal capital asset pricing model (ICAPM) that separately identifies the two components of expected returns, namely, the risk component and the component due to the desire to hedge changes in investment opportunities. The estimated coefficient of relative risk aversion is positive, statistically significant, and reasonable in magnitude. However, expected returns are driven primarily by the hedge component. The omission of this component is partly responsible for the existing contradictory results. 相似文献
102.
Irving Fisher has been overlooked as an influence on William Vickrey's work on taxation and as a link between Edgeworth and
Vickrey. Vickrey was Fisher's last and greatest student. 相似文献
103.
Despite the importance of the London markets and the significance of the relationship for market makers, little published research is available on arbitrage between the FTSE‐100 Index futures and the FTSE‐100 European index options contracts. This study uses the put–call–futures parity condition to throw light on the relationship between options and futures written against the FTSE Index. The arbitrage methodology adopted in this study avoids many of the problems that have affected prior research on the relationship between options or futures prices and the underlying index. The problems that arise from nonsynchroneity between options and futures prices are reduced by the matching of options and futures prices within narrow time intervals with time‐stamped transaction data. This study allows for realistic trading and market‐impact costs. The feasibility of strategies such as execute‐and‐hold and early unwinding is examined with both ex‐post and ex‐ante simulation tests that take into consideration possible execution time lags for the arbitrage trade. This study reveals that the occurrence of matched put–call–futures trios exhibits a U‐shaped intraday pattern with a concentration at both open and close, although the magnitude of observed mispricings has no discernible intraday pattern. Ex‐post arbitrage profits for traders facing transaction costs are concentrated in at‐the‐money options. As in other major markets, despite important microstructure differences, opportunities are generally rapidly extinguished in less than 3 min. The results suggest that arbitrage opportunities for traders facing transaction costs are small in number and confirm the efficiency of trading on the London International Financial Futures and Options Exchange. © 2002 John Wiley & Sons, Inc. Jrl Fut Mark 22:31–58, 2002 相似文献
104.
Tzu-Ling Huang Peter F. Orazem & Darin Wohlgemuth 《American journal of agricultural economics》2002,84(3):615-627
Human capital raises rural incomes, but this effect is swamped by higher returns to human capital in urban markets. This leads to "brain drain" from rural areas. Populations grow more rapidly in rural counties that have a diversified employment base. Farm population grows faster (or declines more slowly) in counties with relatively high farm income, and nonfarm populations grow faster in counties with relatively high nonfarm income. However, higher farm incomes lead to slower nonfarm population growth and vice versa. Rural county government services financed by local taxes or debt have neutral or negative effects on population growth. 相似文献
105.
David C. Hall Thomas O. Knight Keith H. Coble Alan E. Baquet George F. Patrick 《Review of Agricultural Economics》2003,25(2):430-448
Beef cattle producers were surveyed in Texas and Nebraska to investigate perceptions of sources of risk, the effectiveness of risk management strategies, and interest in further risk management education, particularly production risk, using probit analysis. Important decision variables identified are age, prior use of risk management tools, previous attendances of risk management education, and risk aversion. Severe drought and cattle price variability are identified as primary risk factors with potential to affect farm income. Extremely cold weather and disease are of less importance. Understocking pasture and storing hay are perceived most effective as risk management options. 相似文献
106.
We examine the impact of initial public offerings (IPOs) on rival firms and find that the valuation effects are insignificant. This insignificant reaction can be explained by offsetting information and competitive effects. Significant positive information effects are associated with IPOs in regulated industries and the first IPO in an industry following a period of dormancy. Significant negative competitive effects are associated with larger IPOs in competitive industries, those in relatively risky industries, those in high‐performing industries, and those in the technology sector. IPO firms that use the proceeds for debt repayment appear to represent a more significant competitive threat to rival firms relative to IPO firms that use their proceeds for other purposes. 相似文献
107.
Managerial Equity Ownership and the Demand for Outside Directors 总被引:1,自引:0,他引:1
This paper examines the linkage between the use of outside directors and managerial ownership. We conjecture there are two linkages: the standard incentive‐alignment demand for monitoring when managers own little stock and an entrenchment‐amelioration demand when managerial stock ownership is high. As a consequence, we predict the association between managerial ownership and board composition will be nonlinear (U‐shaped if the entrenchment effect is sufficiently pronounced). Using UK data, we find that both quadratic and logarithmic models outperform the simple linear relationship assumed in prior research and that the substitution between managerial ownership and board composition is stronger than hitherto supposed. 相似文献
108.
109.
The theory articulated in this paper suggests that the desire to reduce demand and competitive uncertainty are two separate, important motives for alliance formation. Taking this as a starting point, we predict the configuration of horizontal alliances that we might expect to observe within an industry when firms experience these uncertainties to different degrees. An empirical test of this theory using data from the global auto industry yields results consistent with the view (1) that alliances are a device for reducing both the uncertainties that arise from unpredictable demand conditions and those that arise from competitive interdependence, and (2) that variation of demand uncertainty and competitive uncertainty across firms explains differentials in both the intensity and structure of their horizontal alliance activity. 相似文献
110.
I re-examine Mankiw-Weil's (MW) claim that house prices will fall 47% by 2007. MW argue that the arrival of the Baby Boom generation at adulthood drove up prices during the 1970s. When the beginnings of the Baby Bust generation matured in the 1980s, prices softened. When this generation arrives in earnest, prices will collapse. I make three points: (1) The regression upon which MW hang their prediction has an implausible -8.1% trend, which drives their prediction. (2) Demand directly influences the rental price; the asset price (MW's variable) is influenced by demand only indirectly. I re-run MW's regression, replacing the asset price with the rental price, and their prediction disappears. (3) Relying on data presented by MW, I show that housing consumption rose during the 1970s, after adjusting for income growth. Just when MW say the asset price of housing was rising, consumers behaved as if the price were falling. Consumers were right: The rental price fell by approximately 20% during the 1970s. 相似文献