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Law-invariant risk measures: extension properties and qualitative robustness

We characterize when a convex risk measure associated to a law-invariant acceptance set in L$^∞$ can be extended to L$^p$, 1≤p<∞, preserving finiteness and continuity. This problem is strongly connected to the statistical robustness of the corresponding risk measures. Special attention is paid to concrete examples including risk measures based on expected utility, max-correlation…

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English / 06/09/2014

Beware of black swans: Taking stock of the description-experience gap in decision under uncertainty

Uncertainty pervades most aspects of life. From selecting a new technology to choosing a career, decision makers rarely know in advance the exact outcomes of their decisions. Whereas the consequences of decisions in standard decision theory are explicitly described (the decision from description (DFD) paradigm), the consequences of decisions in the recent decision from experience (…

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English / 01/09/2014

Fast methods for large-scale non-elliptical portfolio optimization

Simple, fast methods for modeling the portfolio distribution corresponding to a non-elliptical, leptokurtic, asymmetric, and conditionally heteroskedastic set of asset returns are entertained. Portfolio optimization via simulation is demonstrated, and its benefits are discussed. An augmented mixture of normals model is shown to be superior to both standard (no short selling)…

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English / 01/09/2014

The executive turnover risk premium

CEO compensation has increased substantially over the past 15 years, but so has forced turnover. Motivated by this observation, we investigate whether part of the development of CEO pay can be explained by a premium which compensates CEOs for increased job risk. We find that for the CEOs of the largest US corporations, a one percentage point increase in turnover risk is, on average,…

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English / 01/08/2014

Can system dynamics learn from social network analysis?

This article deals with the analysis of large or complex system dynamics (SD) models, exploring the benefits of a multimethodological approach to model analysis. We compare model analysis results from SD and social network analysis (SNA) by deploying SNA techniques on a pertinent example from the SD literature—the world dynamics model. Although SNA is a clearly distinct method from…

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English / 24/07/2014

When is a Risky Asset "Urgently Needed"?

The demand for commodities in standard applications typically is increasing in in- come, whereas the demand for the risk free asset in the classic portfolio problem often decreases with income. The latter is shown to occur if and only if the consumer is uncertainty preferences over assets satisfy the condition that the risk free asset is more readily substituted for the risky asset…

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English / 01/07/2014

Informal ties in organizations : a case study

Network techniques are applied to a case study. The results show that using a joint approach can help in giving further insight into the analysis of informal ties in an organization. Special emphasis is given to centrality. The concept of mutual awareness, both on an individual and a global levels, is introduced and illustrated.

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English / 01/07/2014

A fast, accurate method for value-at-risk and expected shortfall

A fast method is developed for value-at-risk and expected shortfall prediction for univariate asset return time series exhibiting leptokurtosis, asymmetry and conditional heteroskedasticity. It is based on a GARCH-type process driven by noncentral t innovations. While the method involves the use of several shortcuts for speed, it performs admirably in terms of accuracy and actually…

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English / 25/06/2014

Expected utility preferences for contingent claims and lotteries

In Arrow’s seminal analysis of optimal risk bearing in which he introduced contingent claim securities, he assumed preferences were representable by a state independent Expected Utility function. Although the classic contingent claim setting assumes agents choose over contingent consumption vectors conditioned on a fixed set of probabilities, later work on information economics…

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English / 22/06/2014

How moral are the principles of biomedical ethics?

Background: The principles of biomedical ethics – autonomy, non-maleficence, beneficence, and justice – are of paradigmatic importance for framing ethical problems in medicine and for teaching ethics to medical students and professionals. In order to underline this significance, Tom L. Beauchamp and James F. Childress base the principles in the common morality, i.e. they claim that…

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English / 17/06/2014

Liquidity creation in the nineteenth century: The role of the clearing houses

This working paper reports the preliminary results of an effort to analyse under what conditions liquidity can be created in an historic context setting. Starting point is the notion made by Dang, Gorton, and Holmstrom (2012) that symmetric ignorance can create liquidity in money markets under certain circumstances. The authors take as an example the New York clearing house (NYCH)…

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English / 01/06/2014

The information content of option demand

This paper combines the concept of market sidedness with excess option demand (changes in open interest) to solve the empirical challenge of separating directional from uninformed trading motives in widely available, unsigned options data. Our measure of options market sidedness persistently predicts the sign and strength of stock returns. Trading strategies conditional on the…

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English / 04/05/2014

Volatility information in index option demand

This paper provides evidence that demand for equity index options has predictive power for
future volatility beyond current and lagged volatility in publicly available data. The predictive power increases prior to macroeconomic announcements and exhibits a positive relation with investor uncertainty about macroeconomic news. Straddle positions that trade on the volatility…

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English / 03/05/2014

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