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No arbitrage and the existence of ACLMMs in general diffusion models

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  • David Criens
  • Mikhail Urusov

Abstract

In a seminal paper, F. Delbaen and W. Schachermayer proved that the classical NA ("no arbitrage") condition implies the existence of an "absolutely continuous local martingale measure" (ACLMM). It is known that in general the existence of an ACLMM alone is not sufficient for NA. In this paper we investigate how close these notions are for single asset general diffusion market models. We show that NA is equivalent to the existence of an ACLMM plus a mild regularity condition on the scale function and the absence of reflecting boundaries. For infinite time horizon scenarios, the regularity assumption and the requirement on the boundaries can be dropped, showing equivalence between NA and the existence of an ACLMM. By means of counterexamples, we show that our characterization of NA for finite time horizons is sharp in the sense that neither the regularity condition on the scale function nor the absence of reflecting boundaries can be dropped.

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  • David Criens & Mikhail Urusov, 2024. "No arbitrage and the existence of ACLMMs in general diffusion models," Papers 2410.09789, arXiv.org.
    • Handle: RePEc:arx:papers:2410.09789
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    1. J. Michael Harrison & Stanley R. Pliska, 1981. "Martingales and Stochastic Integrals in the Theory of Continous Trading," Discussion Papers 454, Northwestern University, Center for Mathematical Studies in Economics and Management Science.
    2. Aleksandar Mijatović & Mikhail Urusov, 2015. "On the Loss of the Semimartingale Property at the Hitting Time of a Level," Journal of Theoretical Probability, Springer, vol. 28(3), pages 892-922, September.
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