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Informational Efficiency with Trading Constraints: A Characterization
SIAM Journal on Financial Mathematics ( IF 1.4 ) Pub Date : 2020-10-13 , DOI: 10.1137/20m1318948
Robert Jarrow , Martin Larsson

SIAM Journal on Financial Mathematics, Volume 11, Issue 4, Page 959-973, January 2020.
Given a market with a price process $S$ populated by heterogeneous traders with differential information, beliefs, and trading constraints, let the smallest information set containing all of the traders' information be denoted $\mathbb{F}$. This market is defined to be informationally efficient [E. Fama, J. Finance, 25 (1970), pp. 1575--1617] with respect to an information set $\mathbb{G} \subseteq \mathbb{F}$ if the price process $S$ arises as an outcome of a competitive market equilibrium. We provide a characterization of such an informationally efficient market. Roughly stated, a market is informationally efficient with respect to $\mathbb{G}$ if and only if there exists an equivalent probability measure that makes the price process normalized by the value of a money market account a martingale with respect to $\mathbb{G}$ if and only if the market satisfies no free lunch with vanishing risk and no dominance with respect to $\mathbb{G}$. This characterization subsumes the economies and characterizations contained in the more restrictive market settings of Jarrow and Larsson [Math. Finance, 22 (2012), pp. 1--30; SIAM J. Financial Math., 6 (2015), pp. 804--824].


中文翻译:

具有交易约束的信息效率:特征

SIAM金融数学杂志,第11卷,第4期,第959-973页,2020年1月。
给定一个价格过程为$ S $的市场,该市场由具有不同信息,信念和交易约束的异构交易者组成,则将包含所有交易者信息的最小信息集表示为$ \ mathbb {F} $。这个市场被定义为信息有效的[E. Fama,J. Finance,25(1970),pp。1575--1617],如果价格过程$ S $是由于以下因素引起的,则关于信息集$ \ mathbb {G} \ subseteq \ mathbb {F} $竞争市场均衡。我们提供了这种信息有效市场的特征。粗略地说,当且仅当存在一种等效的概率测度,该市场对于$ \ mathbb {G} $具有信息效率,该等效概率测度使通过货币市场帐户的价值对$ \ mathbb {G}进行价格标准化的过程当且仅当市场不满足免费午餐且风险逐渐消失且对$ \ mathbb {G} $不具有支配地位时,才使用$。此特征包含了Jarrow和Larsson [Math。Chem。,2006,40:5-4]中限制性更强的市场环境中所包含的经济性和特征。《金融》,2012年第22期,第1--30页;SIAM J.金融数学,2015年第6期,第804--824页]。1--30页;SIAM J.金融数学,2015年第6期,第804--824页]。1--30页;SIAM J.金融数学,2015年第6期,第804--824页]。
更新日期:2020-10-14
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