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排序方式: 共有899条查询结果,搜索用时 8 毫秒
261.
Nicholas Taylor 《European Financial Management》2007,13(1):159-183
This paper introduces a new econometric model of the mispricing associated with (contemporaneous) differences between spot and futures prices. Like existing models, this model assumes that the level of arbitrage activity is positively related to the magnitude of absolute mispricing. However, unlike existing models, the new model assumes that a parameter governing a key feature of this relationship varies over time. Specifically, several versions of a smooth transition model of mispricing are introduced that each allow the shape of the transition function to be determined by a set of explanatory variables. Using high frequency data from the S&P 500 spot and futures market, the results show that the nature of the non‐linearity in mispricing corresponds to arbitrageur behaviour that varies (in a periodic fashion) over the trading day. This is evinced by the superior fit of the new model of mispricing, in comparison to the results based on existing econometric models of mispricing. Finally, the observed periodicity in arbitrageur behaviour indicates that arbitrageurs prefer to trade during certain periods within the trading day – a result that contradicts the findings obtained when using existing econometric models of mispricing. 相似文献
262.
263.
The Impact of Jumps in Volatility and Returns 总被引:17,自引:0,他引:17
This paper examines continuous‐time stochastic volatility models incorporating jumps in returns and volatility. We develop a likelihood‐based estimation strategy and provide estimates of parameters, spot volatility, jump times, and jump sizes using S&P 500 and Nasdaq 100 index returns. Estimates of jump times, jump sizes, and volatility are particularly useful for identifying the effects of these factors during periods of market stress, such as those in 1987, 1997, and 1998. Using formal and informal diagnostics, we find strong evidence for jumps in volatility and jumps in returns. Finally, we study how these factors and estimation risk impact option pricing. 相似文献
264.
HR systems play a critical role in growing knowledge‐intensive firms (KIFs) by facilitating the conversion of human capital into intellectual capital, which has market value. However, the choice of HR system is constrained by the relatively small number of clients they have in business‐to‐business relationships. This article seeks to understand how and why these client relationships affect the choice of HR practices in these firms. We address this issue by drawing on extensive empirical research currently under way in KIFs. Our research shows that HR practices can be influenced strongly by the client, both directly and indirectly. However, some KIFs will use their HR practices as a means of managing the relationships they have with their clients by shaping their boundaries with their clients and building organisational, professional and client identities. The varying client influence can be understood by examining the nature of the power relationship between the client and supplier, which is influenced by the uniqueness of the services provided. This has implications for our understanding of the factors affecting the exercise of a constrained choice of HR systems. 相似文献
265.
Nicholas O'Shaughnessy 《Journal of Business Research》2008,61(5):509-511
This essay, while endorsing Cathi McMullen's core thesis—that Alpaca collecting represents a new kind of rapturous, high-involvement consumption (wherein the consumer/producer distinction is challenged)—seeks to further evolve the explanatory account of this microculture. The drive behind Alpaca collecting may be located in specific trends embedded in both the modern and postmodern condition, such as the rejection of industrialized agriculture. Understanding of this remarkable phenomenon in terms of a striving for social connection is possible; the search for novelty; and the search for a nuanced, idiosyncratic expression of status within an expanding universe of consumer nonconformity. 相似文献
266.
Abstract: Utilising a unique dataset of 502 UK IPOs we undertake an empirical analysis of the relationship between underpricing and value gains on flotation. We find support for our hypothesis that IPO underpricing is related to the extent of anticipated value gains on the private to public transition. We analyse alternative driving mechanisms behind this relationship, and our results suggest that the underpricing of IPOs is driven by both underwriters and issuing company directors, each of whom derive net benefits over the longer term from underpricing at the IPO. 相似文献
267.
Summary. We introduce several efficiency notions depending on what kind of expected utility is used (ex ante, interim, ex post) and
on how agents share their private information, i.e., whether they redistribute their initial endowments based on their own private information, or common knowledge information,
or pooled information. Moreover, we introduce several Bayesian incentive compatibility notions and identify several efficiency
concepts which maintain (coalitional) Bayesian incentive compatibility.
Received: March 25, 1996; revised September 5, 1996 相似文献
268.
A simulation estimator for testing the time homogeneity of credit rating transitions 总被引:1,自引:0,他引:1
The measurement of credit quality is at the heart of the models designed to assess the reserves and capital needed to support the risks of both individual credits and portfolios of credit instruments. A popular specification for credit-rating transitions is the simple, time-homogeneous Markov model. While the Markov specification cannot really describe processes in the long run, it may be useful for adequately describing short-run changes in portfolio risk. In this specification, the entire stochastic process can be characterized in terms of estimated transition probabilities. However, the simple homogeneous Markovian transition framework is restrictive. We propose a test of the null hypotheses of time-homogeneity that can be performed on the sorts of data often reported. We apply the tests to 4 data sets, on commercial paper, sovereign debt, municipal bonds and S&P-rated Corporates. The results indicate that commercial paper looks Markovian on a 30-day time scale for up to 6 months; sovereign debt also looks Markovian (perhaps due to a small sample size); municipals are well-modeled by the Markov specification for up to 5 years, but could probably benefit from frequent updating of the estimated transition matrix or from more sophisticated modeling, and S&P Corporate ratings are approximately Markov over 3 transitions but not 4. 相似文献
269.
Jay F. Nunamaker Jr. Nicholas C. Romano Jr. Robert Owen Briggs 《Group Decision and Negotiation》2002,11(2):69-86
An organization's Intellectual Bandwidth (IB) is its capacity to transform External Domain Knowledge (EDK) into Intellectual Capital (IC), and to convert IC into Applied Knowledge (AK), from which a task team can create value. An organization's IB is an upper boundary on its ability to solve complex problems. To create value, members of an organization must search for knowledge, share it, and, bring it to bear on the issue at hand. The Intellectual Bandwidth of an organization must therefore be, to a certain extent, a function of the ability of its members to access data, information, and knowledge that is relevant in the context of the task at hand in order to understand the causes and consequences of their problem. They must reason about possible solutions and their potential consequences. Throughout the task they must communicate with other stakeholders and subject matter experts as they make a joint effort toward their goal. This paper develops a model of IB based on these and other concepts. It posits that IB is the product of a Hierarchy of Understanding and a Hierarchy of Collaboration. The paper suggests that the model may be useful for analyzing and deploying IT in ways that reduce the cognitive load of bringing EDK and IC to bear on the task at hand. Future research must focus on refining and validating constructs and developing measures of IB, and using those measures to find ways to increase the value derived from EDK and IC. 相似文献
270.
Robert H. Edelstein Branko Urošević Nicholas Wonder 《The Journal of Real Estate Finance and Economics》2005,30(4):447-466
This paper studies the effects that benefits of control and moral hazard have on the evolution of large stakes in REITs. A large risk-averse shareholder trades off the net benefits of REIT business monitoring and control with the cost of bearing risk beyond the level compensated by the REIT return premium. In equilibrium, the large shareholder gradually adjusts his ownership shares level (as long as his marginal benefits from holding shares increase in his REIT stake) towards the long-run competitive equilibrium in which his marginal share valuation coincides with that of the market. Because of the moral hazard, such level of ownership (and monitoring) is, in general, inefficient. The speed of adjustment is positively correlated with the agents risk aversion and company volatility, and negatively correlated with his marginal benefits of control and beneficial monitoring effects. 相似文献