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Rosenbaum R 《Medical economics》1991,68(21):80-2, 85-8, 90-2 passim
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It has been recently shown that rough volatility models, where the volatility is driven by a fractional Brownian motion with small Hurst parameter, provide very relevant dynamics in order to reproduce the behavior of both historical and implied volatilities. However, due to the non‐Markovian nature of the fractional Brownian motion, they raise new issues when it comes to derivatives pricing. Using an original link between nearly unstable Hawkes processes and fractional volatility models, we compute the characteristic function of the log‐price in rough Heston models. In the classical Heston model, the characteristic function is expressed in terms of the solution of a Riccati equation. Here, we show that rough Heston models exhibit quite a similar structure, the Riccati equation being replaced by a fractional Riccati equation. 相似文献
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Market impact is the link between the volume of a (large) order and the price move during and after the execution of this order. We show that in a quite general framework, under no‐arbitrage assumption, the market impact function can only be of power‐law type. Furthermore, we prove this implies that the macroscopic price is diffusive with rough volatility, with a one‐to‐one correspondence between the exponent of the impact function and the Hurst parameter of the volatility. Hence, we simply explain the universal rough behavior of the volatility as a consequence of the no‐arbitrage property. From a mathematical viewpoint, our study relies, in particular, on new results about hyper‐rough stochastic Volterra equations. 相似文献
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A persistent question in industrial economics is the underpinning of the link between market concentration and price. How much of the link can be attributed to market power and how much to market efficiency? This paper develops a theoretical model to address that question. Applied to the US portland cement industry, the model indicates that both impacts matter. In relative terms, however, the market power effect is twice as large as the efficiency effect. An implication for merger policy is that the beneficial efficiency effects of mergers may not be obtained without the detrimental market power effects as well. 相似文献
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Information technology (IT) of insurance companies refers to the variety of organizational units that are in charge of development, implementation and operation of the specific entrepreneurial IT-applications. Our analyses follow the notion that nowadays information technologies departments face increasing cost pressure and the modern reflex of introducing outsourcing-and offshoring-measures does not necessarily lead to cost reductions. Therefore a closer cooperation of IT departments and other organizational units is crucial and strengthens the improvement of competitiveness of the entire insurance company. Furthermore a method leading to a gradual Business Alignment of IT departments within insurance companies will be introduced. 相似文献
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We develop a model in which stock repurchases serve as a defenseagainst takeovers by signaling the manager's private informationabout the value of the firm. The manager repurchases sharesto block a takeover only if the cost of doing so is not toohigh. Since the cost is inversely related to the value of thefirm under his management, a repurchase signals that the valueof the stock is high, blocking a takeover. While a repurchaseincreases the expected value of the stock, it also makes tostock riskier. The model also implies that there are too fewtakeovers for efficiency. 相似文献
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This paper presents the lessons that were learned in technical assistance during the Preventive Marketing Initiative local site demonstration project in the US. The program has been ongoing for 5 years, with social marketers from the Academy for Educational Development and Porter Novelli using social marketing and behavioral science principles to develop HIV prevention programs for and with local teens. With the success of the program, community-based prevention programs are increasingly being requested since better outcomes resulted from a few dollars of investment. Likewise, funders and prevention researchers were challenged to transfer state-of-the-art prevention technologies for communities to apply it readily. The success achieved by the project, however, provides important lessons that would save time and money for future community-based Prevention Marketing efforts. Among the lessons were the need to seek out or establish conditions in the community that are conducive to success, as well as the need to offer technical assistance that would mobilize communities in developing more effective Prevention Marketing programs. 相似文献
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