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Cycles and Sunspots : the Poincare-Hopf approach

Author

Listed:
  • Pierre-Andre Chiappori

    (Columbia University [New York])

  • Julio Davila

    (CERMSEM - CEntre de Recherche en Mathématiques, Statistique et Économie Mathématique - UP1 - Université Paris 1 Panthéon-Sorbonne - CNRS - Centre National de la Recherche Scientifique)

Abstract

This paper deals with the existence of stationary sunspot equilibria (SSE) of finite order in an n-commodity economy. We first provide a simple condition that is sufficient for the existence of SSE associated with any given Markov matrix. This condition encompasses and extends previous results by Guesnerie (Journal of Economic Theory, 1986, 40, 103–128) and Chiappori and Guesnerie (in: Economic complexity, chaos, sunspots, bubbles and nonlinearity, 189, CUP). Also, we consider the order of the corresponding SSE (i.e. the cardinality of their support), and we show that almost all of these are of maximum order. Finally, we study the links between SSE and cycles, and find that the existence of cycles of order 2 detected by our condition implies that of SSE arbitrarily close to cycles of order k for any even k — although cycles of order k may not exist in such models.

Suggested Citation

  • Pierre-Andre Chiappori & Julio Davila, 1996. "Cycles and Sunspots : the Poincare-Hopf approach," Post-Print halshs-00286030, HAL.
    • Handle: RePEc:hal:journl:halshs-00286030
    DOI: 10.1016/0304-4068(95)00751-2
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