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51.
We study a problem of optimal investment/consumption over an infinite horizon in a market with two possibly correlated assets: one liquid and one illiquid. The liquid asset is observed and can be traded continuously, while the illiquid one can be traded only at discrete random times, corresponding to the jumps of a Poisson process with intensity λ, is observed at the trading dates, and is partially observed between two different trading dates. The problem is a nonstandard mixed discrete/continuous optimal control problem, which we solve by a dynamic programming approach. When the utility has a general form, we prove that the value function is the unique viscosity solution of the associated Hamilton–Jacobi–Bellman equation and characterize the optimal allocation in the illiquid asset. In the case of power utility, we establish the regularity of the value function needed to prove the verification theorem, providing the complete theoretical solution of the problem. This enables us to perform numerical simulations, so as to analyze the impact of time illiquidity and how this impact is affected by the degree of observation. 相似文献
52.
Salvatore Sciascia Pietro Mazzola Joseph H. Astrachan Torsten M. Pieper 《Journal of Small Business Management》2013,51(1):83-99
Previous research shows that family involvement in the board of directors can be both positive and negative for sales internationalization. The ambiguous nature of this relationship has hindered theory building on this important phenomenon. Integrating stewardship, stagnation, and upper echelons perspectives, we propose a nonlinear, J‐shaped relationship between family involvement in the board of directors and sales internationalization. Results from running ordinal regression analysis on data drawn from 203 U.S. family businesses confirmed our conjecture. We discuss the implications of our findings for family business theory and practice and indicate avenues for future research. 相似文献
53.
We investigate whether the regulatory improvements made in the aftermath of the global financial crisis have been effective in limiting bank downward window dressing by means of repos in the United States. We find that a strict application of the Basel III regulation wipes out incentives to engage in window dressing to bolster the level of leverage Tier 1 ratio at quarter-end. We also show that the persistency of window dressing is related to the computation of the Federal Deposit Insurance Corporation assessment base, which motivates banks to engage in window dressing to reduce the deposit insurance premium. 相似文献
54.
Salvatore Modica 《Decisions in Economics and Finance》2008,31(2):81-94
This note contains first thoughts on awareness of unawareness in a simple dynamic context where a decision situation is repeated
over time. The main consequence of increasing awareness is that the model the decision maker uses, and the prior which it
contains, becomes richer over time. The decision maker is prepared to this change, and we show that if a projection-consistency
axiom is satisfied unawareness does not affect the value of her estimate of a payoff-relevant conditional probability (although
it may weaken confidence in such estimate). Probability-zero events however, pose a challenge to this axiom, and if that fails,
even estimate values will be different if the decision maker takes unawareness into account. In examining evolution of knowledge
about relevant variable through time, we distinguish between transition from uncertainty to certainty and from unawareness
to certainty directly, and argue that new knowledge may cause posteriors to jump more if it is also new awareness. Some preliminary
considerations on convergence of estimates are included.
相似文献
55.
Salvatore Bertino 《Revue internationale de statistique》2006,74(2):149-159
After defining the concept of representativeness of a random sample, the author proposes a measure of how much the observed sample represents its parent distribution. This measure is called Representativeness Index. The same measure, seen as a function of a sample and of a distribution, will be called Representativeness Function. For a given sample it provides the value of the index for the different distributions under examination, and for a given distribution it provides a measure of the representativeness of its possible samples. Such Representativeness Function can be used in an inferential framework just as the likelihood function, since it gives to any distribution the "experimental support" provided by the observed sample. This measure is distribution-free and it is shown to be a transformation of the wellknown Cramér–von Mises statistic. By using the properties of that statistic, criteria for providing set estimators and tests of hypotheses are introduced. The utilization of the representativeness function in many standard statistical problems is outlined through examples. The quality of the inferential decisions can be assessed with the usual techniques (MSE, power function, coverage probabilities). The most interesting examples turn out to be those of situations that are "non-regular", as for instance the estimation of parameters involved in the support of the parent distribution, or less explored (model choice). 相似文献
56.
This study investigates the impact of climate change adaptation on farm households’ downside risk exposure in the Nile Basin of Ethiopia. The analysis relies on a moment-based specification of the stochastic production function. We use an empirical strategy that accounts for the heterogeneity in the decision on whether to adapt or not, and for unobservable characteristics of farmers and their farm. We find that past adaptation to climate change (i) reduces current downside risk exposure, and so the risk of crop failure; (ii) would have been more beneficial to the non-adapters if they adapted, in terms of reduction in downside risk exposure; and (iii) is a successful risk management strategy that makes the adapters more resilient to climatic conditions. 相似文献
57.
What kind of candidate is selected into a job when the principal has to appoint a committee to measure the candidates’ ability and select a winner? We find that if the committee takes into account the candidate’s gratitude towards them, a candidate with less than first best ability will be selected. A relevant exception may occur if the first best is the overall best candidate. First best selection is always achieved if the committee is anonymous to the candidates. If the committee is not detached enough from the candidates then delegation fares even worse than random selection. 相似文献
58.
The Malthusian theory of evolution disregards a pervasive fact about human societies: they expand through conflict. When this is taken account of the long-run favors not a large population at the level of subsistence, nor yet institutions that maximize welfare or per capita output, but rather institutions that generate large amount of free resources and direct these towards state power. Free resources are the output available to society after deducting the payments necessary for subsistence and for the incentives needed to induce production, and the other claims to production such as transfer payments and resources absorbed by elites. We develop the evolutionary underpinnings of this model, and examine the implications for the evolution of societies in several applications. Since free resources are increasing both in per capita income and population, evolution will favor large rich societies. We will show how technological improvement can increase or decrease per capita output as well as increasing population. 相似文献
59.
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