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Sperner’s lemma and competitive equilibrium with incomplete financial markets

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Listed:
  • Le, Thanh
  • Le Van, Cuong
  • Pham, Ngoc-Sang
  • Sağlam, Çağrı

Abstract

We establish the existence of a competitive equilibrium in a two-period stochastic economy with incomplete financial markets by using Sperner’s lemma. Our existence result covers (but is not limited to) several results in the literature, including the cases of nominal and numéraire assets. Moreover, there may exist a continuum of equilibrium prices.

Suggested Citation

  • Le, Thanh & Le Van, Cuong & Pham, Ngoc-Sang & Sağlam, Çağrı, 2024. "Sperner’s lemma and competitive equilibrium with incomplete financial markets," Economics Letters, Elsevier, vol. 238(C).
    • Handle: RePEc:eee:ecolet:v:238:y:2024:i:c:s0165176524002039
    DOI: 10.1016/j.econlet.2024.111720
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    References listed on IDEAS

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    1. Gale, D. & Mas-Colell, A., 1975. "An equilibrium existence theorem for a general model without ordered preferences," Journal of Mathematical Economics, Elsevier, vol. 2(1), pages 9-15, March.
    2. Aouani, Zaier & Cornet, Bernard, 2011. "Reduced equivalent form of a financial structure," Journal of Mathematical Economics, Elsevier, vol. 47(3), pages 318-327.
    3. Hart, Oliver D., 1975. "On the optimality of equilibrium when the market structure is incomplete," Journal of Economic Theory, Elsevier, vol. 11(3), pages 418-443, December.
    4. Thanh Le & Cuong Le Van & Ngoc-Sang Pham & Cagri Saglam, 2022. "A Direct Proof of the Gale–Nikaido–Debreu Lemma Using Sperner’s Lemma," Journal of Optimization Theory and Applications, Springer, vol. 194(3), pages 1072-1080, September.
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    More about this item

    Keywords

    Sperner’s lemma; Fixed-point theorem; General equilibrium; Incomplete market; Indeterminacy;
    All these keywords.

    JEL classification:

    • C60 - Mathematical and Quantitative Methods - - Mathematical Methods; Programming Models; Mathematical and Simulation Modeling - - - General
    • C62 - Mathematical and Quantitative Methods - - Mathematical Methods; Programming Models; Mathematical and Simulation Modeling - - - Existence and Stability Conditions of Equilibrium
    • D5 - Microeconomics - - General Equilibrium and Disequilibrium
    • G1 - Financial Economics - - General Financial Markets

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