首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   24222篇
  免费   446篇
  国内免费   1篇
财政金融   4607篇
工业经济   1710篇
计划管理   3585篇
经济学   5310篇
综合类   380篇
运输经济   183篇
旅游经济   446篇
贸易经济   3668篇
农业经济   1272篇
经济概况   3451篇
信息产业经济   1篇
邮电经济   56篇
  2021年   133篇
  2020年   247篇
  2019年   408篇
  2018年   495篇
  2017年   502篇
  2016年   515篇
  2015年   290篇
  2014年   531篇
  2013年   2469篇
  2012年   716篇
  2011年   802篇
  2010年   667篇
  2009年   753篇
  2008年   727篇
  2007年   634篇
  2006年   567篇
  2005年   479篇
  2004年   514篇
  2003年   465篇
  2002年   513篇
  2001年   447篇
  2000年   465篇
  1999年   440篇
  1998年   406篇
  1997年   419篇
  1996年   414篇
  1995年   360篇
  1994年   372篇
  1993年   402篇
  1992年   412篇
  1991年   402篇
  1990年   331篇
  1989年   301篇
  1988年   291篇
  1987年   303篇
  1986年   309篇
  1985年   468篇
  1984年   435篇
  1983年   402篇
  1982年   378篇
  1981年   350篇
  1980年   390篇
  1979年   319篇
  1978年   270篇
  1977年   256篇
  1976年   201篇
  1975年   242篇
  1974年   193篇
  1973年   189篇
  1972年   133篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
Optimal investment rules are developed for a producer agency investing in domestic-market generic advertising, export market promotion, and cost-of-production-reducing research. These rules are derived assuming either maximization of producers' surplus or social surplus. The form of the optimality rules differs according to which objective is pursued. Fixed producer agency budgets are also allowed by incorporating a constraint limiting total expenditure on the three activities. Addition of such a constraint substantially alters the structure of the optimal investment rules. Differences in these rules highlight the importance of accounting for the financing mechanism when modeling optimal checkoff fund investment decisions. Optimality rules are simulated using data for the Canadian beef sector. Results suggest historic underinvestment in domestic-market generic advertising but overinvestment in export market promotion. Sensitivity of simulation results underscores the difficulty in assessing optimality of historic producer investment in cost-of-production-reducing research.  相似文献   
32.
This paper analyzes the dynamic relationship between primary and secondary mortgage markets and the short-term and long-term market interest rates. Using a series of monthly data on fixed rate mortgage rates and GNMA rates, we explore the dependence and speed of adjustment in these primary and secondary mortgage rates to each other as well as to the long and short-term government rates. The results indicate that residential mortgage rates in general, appear to follow the long-term rate and are not very sensitive to movements in the short-term interest rate.  相似文献   
33.
34.
This paper uses a unique data set from 1957 to examine whether or not Blue Cross and Blue Shield suffered from an adverse selection death spiral after for-profit commercial insurance companies entered the market for health insurance. Results suggest that moving to experience rating may have helped the Blues counteract adverse selection in the group health insurance market. Adverse selection posed a greater problem for the Blues in the market for individual health insurance, possibly because of differences in the way the Blues screened potential enrollees relative to commercial insurance companies.  相似文献   
35.
Using Turkish industry-level data from 1983 to 1990, we find that politically organized industries receive both higher protection and promotion than unorganized ones. Tariff rates are decreasing (increasing) in the import-penetration ratio and the absolute value of the import-demandelasticity for organized (unorganized) industries. Subsidy rates are decreasing (increasing) in the output-supply elasticity for organized (unorganized) industries. The results are consistent with the predictions of the Grossman–Helpman model and its extension in this paper. The mix of protection and promotion is inversely related to the ratio of their respective marginal deadweight cost measures.  相似文献   
36.
37.
Here we consider the hedging roles of a price futures contract versus a revenue futures contract. In the absence of idiosyncratic output risk, the revenue contract almost always dominates the price contract. Idiosyncratic output risk provides conditions under which the price contract should dominate. When production risk is largely idiosyncratic, a producer with an anticipated long actuals position might combine a long revenue futures position with a short price futures position. © 2004 Wiley Periodicals, Inc. Jrl Fut Mark 24:503–512, 2004  相似文献   
38.
Vendor Managed Inventory (VMI) involves the vendor making the replenishment decision for products supplied to a customer based on various inventory and supply chain policies. Information sharing between supply chain members is required in VMI. Sometimes VMI decisions are delayed and/or the information shared is inaccurate. This research examines the effects of information delay and accuracy, and the sharing of sales and forecast information in a VMI environment facing stationary and nonstationary demand. The simulation experiments show the impact of information delay, information inaccuracy, and information sharing on a variety of performance measures, including inventory levels and fill rates.  相似文献   
39.
40.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号