Safety first portfolio choice based on financial and sustainability returns

This paper lays the mathematical foundations of the notion of an investment's sustainability return and investigates three different models of portfolio selection with probabilistic constraints for safety first investors caring about the financial and the sustainability consequences of their investments. The discussion of these chance-constrained programming problems for stochastic and deterministic sustainability returns includes theoretical results especially on the existence of a unique solution under certain conditions, an illustrating example, and a computational time analysis. Furthermore, we conclude that a simple convex combination of financial and sustainability returns - yielding a new univariate decision variable - is not sufficiently general.Finance; Socially Responsible Investing; Sustainability Value; Safety First Investor

Horizontal equity in the U.S. tax and transfer system

We analyze the distributive justice of the combined burden of income taxes, social security taxes and public transfers on employee households in the United States on the federal level and in six member states. To investigate whether the treatment of families by the aggregate tax and transfer system can be regarded as “fair”, we compare the equivalent incomes of eight different household types. Using the concepts of horizontal equity and system-inherent equivalence scales, we find evidence for a privileged treatment of families with children and a low market income due to the earned income tax credit (EIC), the child tax credit and the supplemental nutrition assistance program (SNAP). If employment taxes are interpreted as taxes in the proper sense, we obtain a favorable treatment of family households and especially married couples for middle-sized market incomes. For high market incomes, we observe a decreasing privilege for all family types. Regarding state tax and transfer systems, temporary aid for needy families (TANF) substantially increases the observed privilege for low-income families compared to singles, while the analyzed state income taxes are generally in line with the federal tax scheme. Overall, our results imply a significant contradiction in value judgments within the U.S. tax and transfer system

The pricing of green bonds: external reviews and the shades of green

We investigate the asset pricing implications of the greenness of bonds. To estimate a green-pricing effect, we determine the ‘green bond premium’ as the difference between the yields of matched conventional and green-labeled bonds. On a cross-sectional average, green bonds experience a statistically significant positive premium. This premium increases with external greenness evaluations, i.e., investors accept premiums of up to 5 basis points for bonds with a substantial environmental agenda. This external validation effect, which is strongest for bonds that are rated dark-green, may offset not incurring information costs, as this effect decreases with increasing age of bonds