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Cycles and sunspot: The Poincare-Hopf approach

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  • Chiappori, P. A.
  • Davila, J.

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.
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Suggested Citation

  • Chiappori, P. A. & Davila, J., 1996. "Cycles and sunspot: The Poincare-Hopf approach," Journal of Mathematical Economics, Elsevier, vol. 26(3), pages 269-284.
    • Handle: RePEc:eee:mateco:v:26:y:1996:i:3:p:269-284
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    1. Peck, James, 1988. "On the existence of sunspot equilibria in an overlapping generations model," Journal of Economic Theory, Elsevier, vol. 44(1), pages 19-42, February.
    2. Chiappori, Pierre-Andre & Geoffard, Pierre-Yves & Guesnerie, Roger, 1992. "Sunspot Fluctuations around a Steady State: The Case of Multidimensional, One-Step Forward Looking Economic Models," Econometrica, Econometric Society, vol. 60(5), pages 1097-1126, September.
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    5. Chiappori, Pierre Andre & Guesnerie, Roger, 1991. "Sunspot equilibria in sequential markets models," Handbook of Mathematical Economics, in: W. Hildenbrand & H. Sonnenschein (ed.), Handbook of Mathematical Economics, edition 1, volume 4, chapter 32, pages 1683-1762, Elsevier.
    6. Barnett,William A. & Geweke,John & Shell,Karl (ed.), 1989. "Economic Complexity: Chaos, Sunspots, Bubbles, and Nonlinearity," Cambridge Books, Cambridge University Press, number 9780521355636, October.
    7. Guesnerie, Roger, 1986. "Stationary sunspot equilibria in an N commodity world," Journal of Economic Theory, Elsevier, vol. 40(1), pages 103-127, October.
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