Cost-of-capital valuation with risky assets

Cost-of-capital valuation is a well-established approach to the valuation of liabilities and is one of the cornerstones of current regulatory frameworks for the insurance industry. Standard cost-of-capital considerations typically rely on the assumption that the required buffer capital is held in risk-less one-year bonds. The aim of this work is to analyze the effects of allowing investments of the buffer capital in risky assets, for example, in a combination of stocks and bonds. In particular, we make precise how the decomposition of the buffer capital into contributions from policyholders and investors varies as the degree of riskiness of the investment increases and highlight the role of limited liability in the case of heavy-tailed insurance risks. With a focus on nonlife insurance, we present a combination of general theoretical results, explicit results for certain stochastic models, and numerical results that emphasize the key findings.