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Formal and Informal Risk Sharing in LDCs: Theory and Empirical Evidence

  • Dubois, Pierre
  • Jullien, Bruno
  • Magnac, Thierry

We develop and estimate a model of dynamic interactions between households where commitment is limited and contracts are incomplete to explain the patterns of income and consumption growth in village economies of less developed countries. Households can insure through both formal contracts and informal agreements, that is, agreements specifying voluntary transfers that need to be self-enforceable. This theoretical setting nests the case of complete markets and the case where only informal agreements are available. We derive a system of non-linear equations for income and consumption growth. A key prediction of our model is that both variables are affected by lagged consumption as a consequence of the interplay of formal and informal contracting possibilities. In a semi-parametric setting, we prove identification, derive testable restrictions and estimate the model with the use of data from Pakistan villages. Empirical results are consistent with the economic arguments. Incentive constraints due to self-enforcement bind with positive probability and formal contracts are used to reduce this probability.

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Paper provided by Institut d'Économie Industrielle (IDEI), Toulouse in its series IDEI Working Papers with number 351.

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Date of creation: May 2005
Date of revision: Dec 2007
Publication status: Published in Econometrica, vol.�76, n°4, juillet 2008, p.�679-725.
Handle: RePEc:ide:wpaper:2829
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