Applying free random variables to random matrix analysis of financial data. Part I: The Gaussian case

We apply the concept of free random variables to doubly correlated (Gaussian) Wishart random matrix models, appearing, for example, in a multivariate analysis of financial time series, and displaying both inter-asset cross-covariances and temporal auto-covariances. We give a comprehensive introduction to the rich financial reality behind such models. We explain in an elementary way the main techniques of free random variables calculus, with a view to promoting them in the quantitative finance community. We apply our findings to tackle several financially relevant problems, such as a universe of assets displaying exponentially decaying temporal covariances, or the exponentially weighted moving average, both with an arbitrary structure of cross-covariances.     

Regulating a Manager‐controlled Natural Monopoly with Unknown Costs

We study the regulation of a manager‐controlled natural monopoly with unknown costs, borrowing from Baron and Myerson (BM) (1982), where the monopoly is controlled by the owner. We consider the case where the regulator can tax the owner as well as the case where she cannot. We find that the optimal price schedule generally lies below the one in the BM model and that it can be as low as the marginal cost if the compensation parameter is sufficiently small and the regulator cannot tax the monopoly owner. We also identify the cases where the monopoly owner prefers to delegate the control to a manager. Copyright © 2016 John Wiley & Sons, Ltd.     

Bridging bargaining theory with the regulation of a natural monopoly

Review of Economic Design - In this paper, we integrate the bargaining theory with the problem of regulating a natural monopoly under symmetric information or asymmetric information with complete...     

Codes of Ethics as Signals for Ethical Behavior

This study investigated effects of codes of ethics on perceptions of ethical behavior. Respondents from companies with codes of ethics (n = 465) rated role set members (top management, supervisors, peers, subordinates, self) as more ethical and felt more encouraged and supported for ethical behavior than respondents from companies without codes (n = 301). Key aspects of the organizational climate, such as supportiveness for ethical behavior, freedom to act ethically, and satisfaction with the outcome of ethical problems were impacted by the presence of an ethics code. The mere presence of a code of ethics appears to have a positive impact on perceptions of ethical behavior in organizations, even when respondents cannot recall specific content of the code.     

The Challenges of Detection and Enforcement of Insider Trading

Taking advantage of the China’s recent anti-corruption campaign, we attempt to examine the effect of public governance on a firm’s incentive to commit fraud. Using enforcement actions data from the Chinese Securities Regulatory Commission (CSRC) from 2004 to 2014, we find that, due to enhanced public governance, firms are less likely to commit fraud in the post-campaign period than in the pre-campaign period. We further show that the effect of public governance is more evident in privately held listed firms, in firms with weak legal environment, and in firms in areas with poor local economies. In addition, we find that older CEOs respond less actively to the public governance caused by anti-corruption regulations. This paper offers clear policy implications for business ethics by indicating that public governance provides external monitoring of corporate decisions.     

Voluntary disclosure practices amongst listed companies in Nigeria

This study examines voluntary disclosure practices amongst listed companies in Nigeria. Results from univariate and multivariate analyses of 52 listed companies suggest an average voluntary disclosure of 44% based on modified Meek, Roberts and Gray (1995) disclosure index comprising 24 disclosure items. The study found significant positive relationship between voluntary disclosure and firm size, measured as the natural logarithm of total asset. The study documents significant positive relationship between market-based definition of firm performance and voluntary disclosure. The study also found significant negative relationship between percentage of block share ownership and percentage of managerial share with firm disclosures. The study has important implication for both individual and institutional investors globally, regulators and policy makers in developing economies.     

The impact of destination attributes on Muslim tourist's choice

The success of marketing destinations for Muslim tourists could be guided by observing Islamic teachings in tourism activities. This study is a trial to explore which Islamic attributes of destinations could be used a base for tailoring Halal tourist packages. Qualitative data were collected by conducting two focus group discussions and fifty three interviews in Malaysia. Two major aspects are identified which may attract Muslim tourists. Some suggestions are also presented to satisfy Muslim tourists. Copyright © 2010 John Wiley & Sons, Ltd.