No unbounded arbitrage, weak no market arbitrage and no arbitrage price system conditions; Equivalent conditions

Manh Hung Nguyen and Thai Ha-Huy

Journal of Mathematical Economics, 2010, vol. 46, issue 1, 128-131

Abstract: Page and Wooders [Page Jr., F.H., Wooders, M., 1996. A necessary and sufficient condition for compactness of individually rational and feasible outcomes and existence of an equilibrium. Economics Letters 52, 153-162] prove that the no unbounded arbitrage (NUBA), a special case of a condition in Page [Page, F.H., 1987. On equilibrium in Hart's securities exchange model. Journal of Economic Theory 41, 392-404], is equivalent to the existence of a no arbitrage price system (NAPS) when no agent has non-null useless vectors. Allouch et al. [Allouch, N., Le Van, C., Page F.H., 2002. The geometry of arbitrage and the existence of competitive equilibrium. Journal of Mathematical Economics 38, 373-391] extend the NAPS introduced by Werner [Werner, J., 1987. Arbitrage and the existence of competitive equilibrium. Econometrica 55, 1403-1418] and show that this condition is equivalent to the weak no market arbitrage (WNMA) of Hart [Hart, O., 1974. On the existence of an equilibrium in a securities model. Journal of Economic Theory 9, 293-311]. They mention that this result implies the one given by Page and Wooders [Page Jr., F.H., Wooders, M., 1996. A necessary and sufficient condition for compactness of individually rational and feasible outcomes and existence of an equilibrium. Economics Letters 52, 153-162]. In this note, we show that all these conditions are equivalent.

Keywords: Arbitrage; Equilibrium; Recession; cone (search for similar items in EconPapers)
Date: 2010
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Citations: View citations in EconPapers (5)

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Working Paper: No unbounded arbitrage, weak no market arbitrage and no arbitrage price system conditions; Equivalent conditions (2008)
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