derive empirical predictions for the direction of correlation and for whether governance is stronger or weaker with multiple …

A number of studies have provided evidence of increased correlation in global financial market returns during bear … implied correlation based on portfolio downside risk measures that does not suffer from this bias. These unbiased quantile … correlation estimates are directly applicable to portfolio optimization and to risk management techniques in general. This simple …

Testing the hypothesis that international equity market correlation increases in volatile times is a difficult exercise … and misleading results have often been reported in the past because of a spurious relationship between correlation and … volatility. This paper focuses on extreme correlation, that is to say the correlation between returns in either the negative or …

framework. Patients differ in severity within a DRG. Providers are to some extent altruistic. For low altruism, a downward … spiral of prices is possible which induces hospitals to focus on low-severity cases. For high altruism, dynamic price … adjustment depends on relation between patients’ severity and benefit. In a steady state, DRG prices are unlikely to give optimal …