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Minimal q-entropy martingale measures for exponential time-changed Lévy processes

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Abstract

We consider structure preserving measure transforms for time-changed Lévy processes. Within this class of transforms preserving the time-changed Lévy structure, we derive equivalent martingale measures minimizing relative q-entropy. They combine the corresponding transform for the Lévy process with an Esscher transform on the time change. Structure preservation is found to be an inherent property of minimal q-entropy martingale measures under continuous time changes, whereas it imposes an additional restriction for discontinuous time changes.

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Correspondence to Thomas Liebmann.

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Kassberger, S., Liebmann, T. Minimal q-entropy martingale measures for exponential time-changed Lévy processes. Finance Stoch 15, 117–140 (2011). https://doi.org/10.1007/s00780-010-0133-9

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  • DOI: https://doi.org/10.1007/s00780-010-0133-9

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