This paper proposes a novel approach to the combination of conditional covariance matrix forecasts based on the use of the Generalized Method of Moments (GMM). It is shown how the procedure can be generalized to deal with large dimensional systems by means of a two-step strategy. The finite...

This paper aims at reconciling two apparently contradictory empirical regularities of financial returns, namely, the fact that the empirical distribution of returns tends to normality as the frequency of observation decreases (aggregational Gaussianity) combined with the fact that the...

The FTSE/JSE Top 40 Index is the flagship index at the Johannesburg Stock Exchange (JSE). It captures more than 80% of the total market capitalisation of all the shares listed on the JSE. It is tradable and the liquid ALSI future is listed on this index. A superficial view of the long-term...

This paper examines time-varying stock price and volatility dynamics of constituent industry sector indices in the Shanghai Stock Exchange. It finds that market beta risk is priced in the time-series movements of stock prices and responds positively to rises in non-diversifiable risk. The asset...

Purpose - The intervalling effect bias of beta refers to the sensitivity of beta estimation with respect to the reference time interval on which returns are measured and its manifestation may indicate the degree of market inefficiencies. The purpose of this paper is to study the intervalling...

Using the multivariate quantile model, this paper develops a global economic policy uncertainty (EPU) spillover measure for each country, and investigates the spillover effects on the country-level stock market idiosyncratic volatility across a sample of 23 economies. The regression results show...