We generalize the classical concept of a certainty equivalent to a model where an investor can trade on a capital market with several future trading dates. We show that if a riskless asset is traded and the investor has a CARA utility then our generalized certainty equivalent can be evaluated...

In der Literatur zur Steuerwirkung des CAPM wurde bisher unterstellt, dass die Steuerzahlungen nicht an die Marktteilnehmer zurückverteilt werden. Diese Annahme ist unrealistisch. Wir lassen sie in diesem Modell fallen.Aus der allgemeinen Gleichgewichtstheorie ist bekannt, dass bei einem...

In the standard CAPM with a riskless asset we give a simple proof of existence of equilibria without assuming concavity of the investor's utility functions. Moreover, we give a uniqueness result using assumptions on the risk aversion of investors.

In the standard CAPM with a riskless asset we give a sufficient condition for uniqueness. This condition is a joint restriction on the agents´ endowments and their preferences which is compatible with non-increasing absolute risk aversion and which is inparticular satisfied with constant...