Martingale property of exponential semimartingales: a note on explicit conditions and applications to asset price and Libor models. Issue 1 (2nd January 2017)

• Record Type: Journal Article
• Authors: Criens, David; Glau, Kathrin; Grbac, Zorana
• Is Part Of: Applied mathematical finance. Volume 24:Issue 1(2017)
• Page Start: 23
• Page End: 37
• Publication Date: 2017-01-02
• Subjects: Exponential semimartingale -- martingale property -- uniform integrability -- semimartingale asset price model -- Libor model; Business mathematics -- Periodicals; 650.0151
• DOI: 10.1080/1350486X.2017.1327324
• Languages: English
• ISSNs: 1350-486X

Abstract

ABSTRACT: We give a collection of explicit sufficient conditions for the true martingale property of a wide class of exponentials of semimartingales. We express the conditions in terms of semimartingale characteristics. This turns out to be very convenient in financial modelling in general. Especially it allows us to carefully discuss the question of well-definedness of semimartingale Libor models, whose construction crucially relies on a sequence of measure changes.