Where does new volatility enter the volatility of securities listed in many countries? While literature has focused on where information enters the price, I develop a framework to study how each market's volatility contributes to the permanent volatility of the Asset. I build a VECM with an...

Purpose The purpose of this paper is to investigate whether Islamic stock indexes outperform conventional stock indexes, in terms of informational efficiency and risk, during the recent financial instability period. Design/methodology/approach The paper uses a state space model combined with a...

The possibility to measure the relative contribution of agents and exchanges to the price formation process in high-frequency financial markets acquired increasingly importance in the financial econometric literature. In this paper I propose to adopt fully data-driven approaches to identify...

We examine the stock market valuation of large and systemic U.S. banks over the period 2003Q4-2014Q1. These are the banks included in a series of supervisory capital review and stress tests conducted annually since 2009 by the Federal Reserve. We extend Gordon's growth model of stock valuation,...

This work quantifies the financial and macroeconomic effects of the most significant Brexit events from 23 June 2016 up to 31 December 2019 for fifteen economies. The study uses high-frequency data and shows that following the referendum outcome, overall the 10-year government bond yield of the...

The study examines the spillover between Twitter Uncertainty Indexes (TUI) and 10 US sectors. Our methodology is twofold: a time-varying parameter vector autoregression (TVP-VAR) to explore the dynamic connectedness among sectoral returns and a regression, mainly ordinary least squares (OLS) and...

We extend the classic ''martingale-plus-noise'' model for high-frequency returns to accommodate an error correction mechanism and endogenous pricing errors. It is motivated by (i) novel empirical evidence documenting that microstructure noise exhibits frequently changing patterns of serial...

This paper conducts an investigation of volatility transmission between stock markets in Hong Kong, Europe and the United States covering the time period from 2000 up to 2011. Using intradaily data we compute realized volatility time series for the three markets and employ a Heterogeneous...

This study examines the impact of investor attention on portfolio volatility and sectoral risk spillovers in Borsa Istanbul. We use advanced econometric models, including E-GARCH-X, GJR-GARCH-X, and multivariate BEKK-GARCH-X, and analyze daily data from January 2004 to June 2024. We find that...

This study sets out to identify the trading patterns of foreign investors versus those of Qatar's domestic counterparts. Specifically, two chief issues are addressed. First, whether the buyside and sellside behaviours of individual and institutional foreign investor groups are different from...