Local martingales, arbitrage, and viability
Abstract
We revisit a standard model of security prices as Ito processes, and provide some new economic insights about the role of arbitrage and credit limits within such a model. We show that the standard assumptions of a positive state prices and existence of an equivalent martingale measure exclude prices that are viable models of competitive equilibrium and that are potentially useful for modeling actual financial markets. These models have been dismissed in the past as allowing arbitrage, but in fact an agent who prefers more to less and who has limited access to credit may have an optimum.Download Info
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Bibliographic Info
Article provided by Springer in its journal Economic Theory.
Volume (Year): 16 (2000)
Issue (Month): 1 ()
Pages: 135-161
Note: Received: June 9, 1999; revised version: October 4, 1999
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Related research
Keywords: Arbitrage; Viability; Wealth constraints; Continuous-time financial markets; Equivalent martingale measures.;Find related papers by JEL classification:
- D50 - Microeconomics - - General Equilibrium and Disequilibrium - - - General
- G12 - Financial Economics - - General Financial Markets - - - Asset Pricing
- G13 - Financial Economics - - General Financial Markets - - - Contingent Pricing; Futures Pricing
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Citations
Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.Cited by:
- Claudio Fontana, 2013. "Weak and strong no-arbitrage conditions for continuous financial markets," Papers 1302.7192, arXiv.org.
- Claudio Fontana & Bernt {\O}ksendal & Agn\`es Sulem, 2013. "Viability and martingale measures under partial information," Papers 1302.4254, arXiv.org.
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