Financial literature considers volatility as a good proxy for the risk level and thus the crucial parameter in many financial techniques and strategies. As such, the aim of this paper is to analyse the evolution of time series volatility and detect significant long-term variance changes....

This paper empirically investigates whether there is an evolution in the relation between stock market trading volume and volatility in 23 developed and 15 emerging markets. To answer this question, we develop a dynamic application of the TARCH (1, 1) model and first prove that the relationship...