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Arbitrage and equilibrium with portfolio constraints

机译:有投资组合约束的套利和均衡

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We consider a multiperiod financial exchange economy with nominal assets and restricted participation, where each agent’s portfolio choice is restricted to a closed, convex set containing zero, as in Siconolfi (Non-linear Dynamics in Economics and Social Sciences, 1989). Using an approach that dates back to Cass (CARESS Working Paper, 1984; J Math Econ 42:384–405, 2006) in the unconstrained case, we seek to isolate arbitrage-free asset prices that are also quasi-equilibrium or equilibrium asset prices. In the presence of such portfolio restrictions, we need to confine our attention to aggregate arbitrage-free asset prices, i.e., for which there is no arbitrage in the space of marketed portfolios. Our main result states that such asset prices are quasi-equilibrium prices under standard assumptions and then deduces that they are equilibrium prices under a suitable condition on the accessibility of payoffs by agents, i.e., every payoff that is attainable in the aggregate can be marketed through some agent’s portfolio set. This latter result extends previous work by Martins-da-Rocha and Triki (Working Paper, University of Paris 1, 2005).
机译:我们考虑具有名义资产和受限参与的多期金融交换经济,其中每个代理人的投资组合选择都限于包含零的封闭凸集,如Siconolfi(《经济学和社会科学非线性动力学》,1989年)。在无约束的情况下,使用可追溯至Cass的方法(CARESS工作论文,1984; J Math Econ 42:384–405,2006),我们试图隔离无套利资产价格,该价格也属于准均衡或均衡资产价格。在存在此类投资组合限制的情况下,我们需要将注意力集中在无套利的总资产价格上,即在市场投资组合空间内没有套利。我们的主要结果表明,此类资产价格是标准假设下的准均衡价格,然后推论为在代理商获得收益的适当条件下,它们是均衡价格,即,总计中可获得的每个收益都可以通过一些代理商的投资组合。后一个结果扩展了Martins-da-Rocha和Triki的先前工作(2005年,巴黎大学,工作论文)。

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