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PPP rules, macroeconomic (In)stability and learning

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  • Luis-Felipe Zanna

Abstract

Governments in emerging economies have pursued real exchange rate targeting through Purchasing Power Parity (PPP) rules that link the nominal depreciation rate to either the deviation of the real exchange rate from its long run level or to the difference between the domestic and the foreign CPI-inflation rates. In this paper we disentangle the conditions under which these rules may lead to endogenous fluctuations due to self-fulfilling expectations in a small open economy that faces nominal rigidities. We find that besides the specification of the rule, structural parameters such as the share of traded goods (that measures the degree of openness of the economy) and the degrees of imperfect competition and price stickiness in the non-traded sector play a crucial role in the determinacy of equilibrium. To evaluate the relevance of the real (in)determinacy results we pursue a learn ability (E-stability) analysis for the aforementioned PPP rules. We show that for rules that guarantee a unique equilibrium, the fundamental solution that represents this equilibrium is learnable in the E-stability sense. Similarly we show that for PPP rules that open the possibility of sunspot equilibria, a common factor representation that describes these equilibria is also E-stable. In this sense sunspot equilibria and therefore aggregate instability are more likely to occur due to PPP rules than previously recognized.

Suggested Citation

  • Luis-Felipe Zanna, 2004. "PPP rules, macroeconomic (In)stability and learning," International Finance Discussion Papers 814, Board of Governors of the Federal Reserve System (U.S.).
    • Handle: RePEc:fip:fedgif:814
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    Cited by:

    1. James Bullard & Eric Schaling, 2009. "Monetary Policy, Determinacy, and Learnability in a Two‐Block World Economy," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 41(8), pages 1585-1612, December.
    2. GEORGE W. EVANS & BRUCE McGOUGH, 2007. "Optimal Constrained Interest-Rate Rules," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 39(6), pages 1335-1356, September.
    3. Claus Rabe & Harris Selod, "undated". "Place-based economic policies: international lessons for South Africa," Working Papers 11, Economic Research Southern Africa.
    4. Eric Schaling & James Bullard, 2005. "Monetary Policy, Determinacy, and Learnability in the Open Economy," Working Papers 011, Economic Research Southern Africa.

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    Keywords

    Purchasing power parity; Foreign exchange rates;

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