Calibration risk: Illustrating the impact of calibration risk under the Heston model

It is already well documented that model risk is an important issue regarding the pricing of exotics (see Schoutens et al., in A perfect calibration! Now what?, Wilmott Magazine, March 2004: pp 66–78, 2004). Arguments have been made to put this into the perspective of bid-ask pricing using the theory of conic finance and pricing to acceptability (Cherny and Madan Review of Financial Studies, 22: 2571–2606, 2009). In this paper we show also the presence and importance of calibration risk. More particularly, we point out that a variety of plausible calibration methods lead again to serious price differences for exotics and different distributions of the P&L of the delta-hedging strategy. This is illustrated under the popular Heston stochastic volatility model, which is used among practitioners to price all kinds of exotic and structured products. This paper shows that it is prudent to take some additional safety margin into account for the pricing of these structured notes.     

The Impact of Political Instability on Inflation Volatility in Africa

This paper investigates whether political instability leads to volatile inflation using a panel of 49 African countries. The study uses novel measures of political instability, particularly the state failure index and state fragility index. In the field of political instability and inflation volatility, this is the first study to measure inflation volatility as the conditional variance of inflation estimated from GARCH (1, 1) model. Adopting the system‐generalized method of moments estimator for linear dynamic panel models for the sample period 1985‐2009, the study documents a positive statistically significant effect of political instability on inflation volatility.     

Building multivariate Sato models with linear dependence

The increased trading in multi-name financial products has required the development of state-of-the-art multivariate models. These models should be computationally tractable and, at the same time, flexible enough to explain the stylized facts of asset log-returns and of their dependence structure. The popular class of multivariate Lévy models provides a variety of tractable models, but suffers from one major shortcoming: Lévy models can replicate single-name derivative prices for a given time-to-maturity, but not for the whole range of quoted strikes and maturities, especially during periods of market turmoil. Moreover, there is a significant discrepancy between the moment term structure of Lévy models and the one observed in the market. Sato processes on the other hand exhibit a moment term structure that is more in line with empirical evidence and allow for a better replication of single-name option price surfaces. In this paper, we propose a general framework for multivariate models characterized by independent and time-inhomogeneous increments, where the asset log-return processes at unit time are modeled as linear combinations of independent self-decomposable random variables, where at least one self-decomposable random variable is shared by all the assets. As examples, we consider two general subclasses within this new framework, where we assume a normal variance-mean mixture with a one-sided tempered stable mixing density or a difference of one-sided tempered stable laws for the distribution of the risk factors. Particular attention is given to the models' ability to explain the asset dependence structure. A numerical study reveals the advantages of these new types of models.     

Coda

Technology and globalization have the potential to make higher education more affordable and accessible. In practice, however, rising costs limit educational access, and competition threatens the sustainability of many colleges and universities (Grummon, 2009). With the relevance of traditional curricula in question and the demand for alternate delivery methods expanding, many higher learning institutions face a challenge to reinvent themselves (Barnatt, 2008; Grummon, 2009; Lee, Brennan, & Green, 2009). We asked four higher education leaders from demographically and structurally diverse institutions to address the question, “How will colleges and universities serve the global knowledge economy in the coming decades?” Our respondents represent perspectives from multiple educational paradigms—public and private, local and international, for‐profit and nonprofit, brick‐and‐mortar and online. George Mihel, president of Sauk Valley Community College in Illinois, offers a position paper on the need to transform some of higher education’s deep‐rooted institutional traditions. George Miller, chancellor of American InterContinental University, teams with Caroline Molina‐Ray, a University of Phoenix faculty member, to address how higher education can foster both technological competency and critically reflexive thinking. Naana J. S. Opoku‐Agyemang, vice chancellor of the University of Cape Coast in Ghana, offers insight into the unique challenges and accomplishments of higher education in Africa. Finally, Vicki T. Purslow, associate dean of the College of Arts and Sciences at Southern Oregon University, and Christine Cook Florence, a higher education marketing consultant, present a commentary synthesizing the symposium contributions and issuing a call to action for higher education leaders. Together, these diverse perspectives offer a glimpse into the higher education of the future.</     

The effects of governmental accounting methods on asset-acquisition decisions: A theoretical model and three case studies

This study explores possible effects of municipal accounting practices on asset-acquisition decisions. Theoretical decision models are developed using expenditure and depreciation accounting for reporting performance. The models suggest that expenditure accounting may lead to uneconomical leasing. Case studies of three cities focused on comparing present values of their leases to purchase alternatives and on interviewing department administrators. Significant uneconomical leases were found. The case studies suggest that a complete model of municipal administrators' acquisition decisions include consideration of accounting methods used to report performance; perceived risk of obsolescence; restrictions of grantors, third-party reimbursers and higher management; and administrators' background and training.     

Determinants of Quantitative Information Withholding in Annual Reports

In recent years, the determinants of voluntary disclosure have been explored in an extensive body of empirical research. One major limitation of those studies is that none has tried to find out whether voluntary disclosures were occasional or continuous over time. Yet this point is particularly important, as the voluntary disclosure mechanism can only be fully effective if the manager consistently reports the same items. This paper examines the factors associated with the decision to stop disclosing an item of information previously published voluntarily (henceforth ‘information withholding’ or IW). To measure information withholding, we code 178 annual reports of French firms for three consecutive years. Although disclosure scores are relatively stable over time, we find that this does not mean there is no change in voluntary disclosure across the years. We document that IW is a widespread practice: on average, one voluntary item out of seven disclosed in a given year is withheld the following year. We show that information withholding is mainly related to the firm's competition environment, ownership diffusion, board independence and the existence of a dual leadership structure (separate CEO and chairman).     

Towards a $$\Delta $$Δ-Gamma Sato multivariate model

Review of Derivatives Research - The increased trading in multi-name financial products has paved the way for the use of multivariate models that are at once computationally tractable and flexible...     

The impact of supervisor interpersonal justice on supervisor-directed citizenship behaviors in social enterprises: a moderated mediation model

Abstract

While prior research has examined the strategic role of social enterprise managers in the achievement of a double economic and social performance objective, a clear understanding of the supervisors’ role in fostering employees’ attitudes and behaviors is still lacking. To address this gap, our paper aims to examine the impact of supervisor interpersonal justice on supervisor-directed citizenship behaviors by developing a moderated mediation model. Survey data were collected from 196 supervisor-subordinate dyads employed in diverse French social enterprises. Our results show that psychological contract breach mediates the supervisor interpersonal justice – supervisor-directed citizenship behaviors relationship. Further, employees’ prosocial motivations moderate this indirect effect. Our research provides insight into the mechanisms of social exchange relationships in social enterprises. In a practical perspective, it also demonstrates that the development of an effective HRM in social enterprises requires the implementation of specific training and development programs for managers.