Do High‐Frequency Data Improve High‐Dimensional Portfolio Allocations?

This paper addresses the debate about the usefulness of high‐frequency (HF) data in large‐scale portfolio allocation. We construct global minimum variance portfolios based on the constituents of the S&P 500. HF‐based covariance matrix predictions are obtained by applying a blocked realized kernel estimator, different smoothing windows, various regularization methods and two forecasting models. We show that HF‐based predictions yield a significantly lower portfolio volatility than methods employing daily returns. Particularly during the 2008 financial crisis, these performance gains hold over longer horizons than previous studies have shown, translating into substantial utility gains for an investor with pronounced risk aversion. Copyright © 2013 John Wiley & Sons, Ltd.     

Precautionary advice about mobile phones: public understandings and intended responses

There is a widespread academic and policy debate about public responses to precaution in public health campaigns. This paper explores these issues in relation to the precautionary stance adopted in the UK around the regulation of mobile telecommunications. The aim of the paper is to examine the nature of attitudes to precaution, and the way in which these, along with other relevant variables, relate to the intention to adopt relevant behaviours. The results from an experimental study (n = 173) indicate that people distinguish between two dimensions of precaution: firstly in relation to its value or necessity per se and secondly as anchored to notions of governance. The two variables differentially relate to other variables including trust and uncertainty, and are predictive of intended behaviour change indirectly, through worry about mobile phone risks. Precautionary advice was generally interpreted as causing concern rather than providing reassurance. The results suggest that precaution may be considered a valuable stance but this does not mean that it is seen as good governance or that it will reduce concern. Whilst the discourse of precaution is aimed at reducing concern, it appears that the uptake of relevant behaviours is largely triggered by worry.     

The Effects of Commitment to Moral Self-improvement and Religiosity on Ethics of Business Students

Using survey methodology we examined the relationships between commitment to moral self-improvement (CMSI), religiosity, ethical problem recognition, and behavioral intentions in a sample of 242 business students. Results of the study suggest that CMSI predicts ethical problem recognition and behavioral intentions. Our findings also suggest that CMSI is positively related to religiosity. The study provides some evidence of CMSI being a mediator in the influence of religiosity on ethical problem recognition and behavioral intentions. Compared to religiosity, CMSI turned out to be a better predictor of perceived importance of ethics, ethical problem recognition, and ethical behavioral intentions. The results of the study have implications for increasing understanding of ethical decision-making, future studies of business ethics, and business ethics education.     

Management priorities of digital health service start-ups in California

International Entrepreneurship and Management Journal - Digitalisation has revolutionised health service delivery, which has provided global business opportunities for start-ups that specialise in...