Three main issues are explored in this thesis—volatility measurement, volatility spillover and large-dimension covariance matrices. For the first question of volatility measurement, this thesis compares two newly-proposed, high-frequency volatility measurement models, namely realized...

We focus on an exogenous event that changes the cost of capital of a company – the addition of its stock to the S&P 500 index – and investigate how companies react to it by modifying their corporate financial and investment policies. This allows us to test capital structure theories in an...