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Erscheinungsjahr: 
1998
Schriftenreihe/Nr.: 
SFB 373 Discussion Paper No. 1998,25
Verlag: 
Humboldt University of Berlin, Interdisciplinary Research Project 373: Quantification and Simulation of Economic Processes, Berlin
Zusammenfassung: 
In this paper, we consider a security market in which two investors on different information levels maximize their expected logarithmic utility from terminal wealth. While the ordinary investor's portfolio decisions are based on a public information flow, the insider possesses from the beginning extra information about the outcome of some random variable G, e.g., the future price of a stock. We solve the two optimization problems explicitly and rewrite the insider's additional expected logarithmic utility in terms of a relative entropy. This allows us to provide simple conditions on G for the finiteness of this additional utility and to show that it is basically given by the entropy of G.
Schlagwörter: 
insider trading
entropy
utility maximization
initial enlargement of filtrations
relative entropy
Persistent Identifier der Erstveröffentlichung: 
Dokumentart: 
Working Paper

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