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171.
Jan G. De Gooijer 《Journal of econometrics》1980,14(3):365-379
Formulae for the numerical computation of the first four exact moments of the sample autocorrelations, given a time series realisation from a general autoregressive moving average process of order (p, d, q) with d=0 or 1, are presented. The exact mean and variance of the sample autocorrelations are computed for various sample sizes and several time series models. The evaluated results are compared with those obtained from approximate formulae for the mean and variance of the sample autocorrelations. A specification of the numerical accuracy of the first two exact moments is included. 相似文献
172.
This paper explores the role of contract farming arrangements in agricultural intensification in sub-Saharan Africa, combining secondary literature and original case material from Mozambique. The paper extends the scope of “contract farming” beyond the formal contracts between large companies and small-scale producers to include less formal credit agreements between farmers and traders. It argues that such informal contract arrangements are evidence of farmers' agency in “real markets.” In the studied cases, farmers use contract farming opportunities to intensify agricultural production by investing in irrigation and inputs. While informal contracts typically concern locally consumed crops, thus with more possibilities for side selling than formal contracts for export crops with company-controlled markets, informal contract compliance reflects closely knit social ties between the contracting parties. In both formal and informal contracts, purchasers tend to seek out producers who are already irrigating, thus obtaining gains from farmers' earlier investments. This also implies contract farming as a mechanism for accelerating social differentiation arising from unequal access to irrigation. The paper argues that the significance of informal contracts in the studied cases raises the possibility that informal contract farming by local traders plays a more important role in agrarian transformation in Africa than formal contract farming by large companies. 相似文献
173.
174.
Jan Fałkowski 《Agricultural Economics》2018,49(5):659-668
In this article, we test to what extent the food aid granted by the U.S. during the Cold War was strategically motivated and used to promote U.S. interests. Using the data for the period 1971–1990, we investigate whether U.S. wheat aid had an effect on recipient countries’ total import of American products. The evidence we provide suggests a positive and robust relationship and thus it is consistent with the argument that U.S. food aid helped to create larger markets for U.S. producers. 相似文献
175.
Michal Andrle Andrew Berg R. Armando Morales Rafael Portillo Jan Vlcek 《The South African journal of economics. Suid-afrikaanse tydskrif vir ekonomie》2015,83(4):475-505
We develop a semi‐structural new‐Keynesian open‐economy model – with separate food and non‐food inflation dynamics to study the sources of inflation in Kenya in recent years. To do so, we filter international and Kenyan data (on output, inflation and its components, exchange rates and interest rates) through the model to recover a model‐based decomposition of most variables into trends (or potential values) and temporary movements (or gaps) – including for the international and domestic relative price of food. We use the filtration exercise to recover the sequence of domestic and foreign macroeconomic shocks that account for business cycle dynamics in Kenya over the last few years, with a special emphasis on the various factors (international food prices, monetary policy) driving inflation. We find that while imported food price shocks have been an important source of inflation, both in 2008 and more recently, accommodating monetary policy has also played a role, most notably through its effect on the nominal exchange rate. We also discuss the implications of this exercise for the use of model‐based monetary policy analysis in sub‐Saharan African countries. 相似文献
176.
177.
Digital transformation is fundamentally changing the business landscape. It is also affecting the roles of top managers within firms. Our survey of more than 160 senior managers in Europe suggests that digitalization, rather than encouraging more decentralized forms of management, will lead to an expanded role for headquarters and further empowerment of top managers. While acknowledging the benefits of the digital transformation, in this Executive Digest we identify five key challenges for newly empowered top managers and offer solutions for these digitalization traps. 相似文献
178.
179.
Existing research on product design has demonstrated the importance of aesthetics in generating favorable consumer responses. However, the literature has only recently begun to explore if and to what extent the impact of product design is influenced by brand strength. Whereas some research indicates that strong brands may benefit less strongly from aesthetically attractive designs, other research suggests that attractive designs are more persuasive when they are paired with a strong brand. In this research, these two competing predictions were tested through three studies with German car buyers. In Study 1, participants were exposed to a fictitious car that was paired with a randomly chosen brand name. In Study 2, participants were presented with a set of existing cars and were asked to choose one. Both studies yield converging evidence and show that product design and brands interact in a positive fashion, suggesting that attractive designs exert a greater influence on consumers’ decision processes when they are accompanied by a strong brand. Study 3 extended these findings by demonstrating that strong brands only increase the impact of attractive designs when perceived risk is high but not when it is low. 相似文献
180.
Esben Rahbek Pedersen 《Journal of Business Ethics》2010,91(2):155-166
The purpose of this article is to develop a model of how managers perceive the responsibilities of business towards society. The article is based on the survey responses of more than 1,000 managers in eight large international firms. It is concluded that the managerial perceptions of societal responsibilities differ in some respects from the mainstream models found in the corporate social responsibility (CSR) and business ethics literature. The article is an output of RESPONSE: an EU- and corporate-funded research project on managerial perceptions of CSR. 相似文献