I study the effects of risk and ambiguity (Knightian uncertainty) on optimal portfolios and equilibrium asset prices when investors receive information that is difficult to link to fundamentals. I show that the desire of investors to hedge ambiguity leads to portfolio inertia and excess...

I study the effects of aversion to risk and ambiguity (uncertainty in the sense of Knight (1921)) on the value of the market portfolio when investors receive public information that they find difficult to link to fundamentals and hence treat as ambiguous. I show that small changes in public...

The notion of the greenhouse gas (GHG) aversion (GHGA) is introduced into the mean-variance portfolio (MVP) framework. GHGA is assumed to be a weighted sum of the portfolio holdings’ GHG emission intensities. A new portfolio performance measure, the GHGA-tilted Sharpe ratio, is offered for...

Abstract: Venture Capital-Geber leisten einen entscheidenden Beitrag zur Finanzierung von jungen innovativen Unternehmen. Diese Investoren engagieren sich nicht nur monetär, sondern beraten die Jungunternehmer auch. Dabei ist die Beziehung zwischen den beiden Parteien durch eine Vielzahl von...