Time changed Brownian motions are extensively applied as decision models for asset returns in Finance. On the other hand infinite divisible normal mixtures generate time changed Brownian motions. The standard generalization leading to the multivariate setting of normal mean variance mixtures...

The risk appetite of insurance companies fluctuates over time in a quasi cyclical fashion. When their capitalization is high (low), companies choose portfolios with a high (small) share of risky assets. We show that this phenomenon may have the same source as the underwriting cycle, namely...