Portuguese Economic Journal

, Volume 6, Issue 3, pp 133–150 | Cite as

Imperfect competition and the modelling of expectations in macroeconomics

  • Neil RankinEmail author
Original Article


We show that when a model of the macroeconomy is based on imperfect, rather than perfect, competition, this may increase the problem of how to model agents’ expectations. We provide a simple example using an overlapping-generations economy with the potential for unemployment. Under certain assumptions about how consumers migrate between locations between the first and second periods of their lives, this extra issue regarding expectations arises. Imperfect competition may increase agents’ forecasting difficulties because they have to forecast not only future equilibrium prices, but also future out-of-equilibrium prices, and by definition the latter are never actually observed.


Imperfect competition Macroeconomics Rationality of expectations 

JEL Classification

E20 D84 


  1. Akerlof GA, Yellen JL (1985) A near-rational model of the business cycle with wage and price inertia. Q J Econ 100(Suppl):823–838CrossRefGoogle Scholar
  2. Ball L, Romer D (1990) Real rigidities and the non-neutrality of money. Rev Econ Stud 57:183–203CrossRefGoogle Scholar
  3. Ball L, Romer D (1991) Sticky prices as coordination failure. Am Econ Rev 81:539–552Google Scholar
  4. Barro RJ, Grossman HI (1971) A general disequilibrium model of income and employment. Am Econ Rev 61:82–93Google Scholar
  5. Benassy JP (1975) Neo-Keynesian disequilibrium theory in a monetary economy. Rev Econ Stud 42:503–523CrossRefGoogle Scholar
  6. Benassy JP (1991a) Optimal government policy in a macroeconomic model with imperfect competition and rational expectations. In: Barnett WA et al (eds) Equilibrium theory and applications. Cambridge University Press, CambridgeGoogle Scholar
  7. Benassy JP (1991b) Microeconomic foundations and properties of a macroeconomic model with imperfect competition. In: Arrow KJ (ed) Issues in contemporary economics, vol. 1. Markets and welfare. Macmillan, LondonGoogle Scholar
  8. Benassy JP (1993) Imperfect competition and the sub-optimality of rational expectations. Eur Econ Rev 37:1315–1330CrossRefGoogle Scholar
  9. Benassy JP (1995) Classical and Keynesian features in macroeconomic models with imperfect competition. In: Dixon H, Rankin N (eds) The new macroeconomics: imperfect markets and policy effectiveness. Cambridge University Press, CambridgeGoogle Scholar
  10. Blanchard OJ, Kiyotaki N (1987) Monopolistic competition and the effects of aggregate demand. Am Econ Rev 77:647–666Google Scholar
  11. Caplin A, Leahy J (1991) State-dependent pricing and the dynamics of money and output. Q J Econ 106:683–708CrossRefGoogle Scholar
  12. Caplin A, Spulber D (1987) Menu costs and the neutrality of money. Q J Econ 102:703–726CrossRefGoogle Scholar
  13. Chari VV, Kehoe PJ, McGrattan ER (2000) Sticky price models of the business cycle: can the contract multiplier solve the persistence problem? Econometrica 68:1151–1179CrossRefGoogle Scholar
  14. Christiano LJ, Eichenbaum M, Evans CL (2005) Nominal rigidities and the dynamic effects of a shock to policy. J Polit Econ 113:1–45CrossRefGoogle Scholar
  15. D’Aspremont C, Dos Santos Ferreira R, Gerard-Varet LA (1991) Imperfect competition, rational expectations and unemployment. In: Barnett WA et al (eds) Equilibrium theory and applications. Cambridge University Press, CambridgeGoogle Scholar
  16. D’Aspremont C, Dos Santos Ferreira R, Gerard-Varet LA (1995) Imperfect competition in an overlapping-generations model: a case for fiscal policy. Annales d’Economie et de Statistique 37/38:531–556Google Scholar
  17. Deaton A (1992) Understanding consumption. Oxford University Press, OxfordGoogle Scholar
  18. Dehez P (1985) Monopolistic competition and involuntary unemployment. J Econ Theory 36:160–165CrossRefGoogle Scholar
  19. Devereux MB, Head AC, Lapham BJ (1996) Monopolistic competition, increasing returns and the effects of government spending. J Money Credit Bank 28:233–254CrossRefGoogle Scholar
  20. Dixit AK, Stiglitz JE (1977) Monopolistic competition and optimum product diversity. Am Econ Rev 67:297–308Google Scholar
  21. Dixon HD (1987) A model of imperfect competition with Walrasian features. Oxf Econ Pap 39:134–160Google Scholar
  22. Dixon HD, Rankin N (1994) Imperfect competition and macroeconomics: a survey. Oxf Econ Pap 46:171–199Google Scholar
  23. Farmer REA (1993) The macroeconomics of self-fulfilling prophecies, Cambridge. MIT, MAGoogle Scholar
  24. Fischer S (1977) Long-term contracts, rational expectations and the optimal money supply rule. J Polit Econ 85:163–190CrossRefGoogle Scholar
  25. Grandmont JM (1983) Money and value. Cambridge University Press, CambridgeGoogle Scholar
  26. Gray J (1976) Wage indexation: a macroeconomic approach. J Monet Econ 3:221–235CrossRefGoogle Scholar
  27. Grossman GM, Helpman E (1991) Innovation and growth in the global economy. MIT, Cambridge, MAGoogle Scholar
  28. Hairault JO, Portier F (1993) Money, new Keynesian macroeconomics and the business cycle. Eur Econ Rev 37:1533–1568CrossRefGoogle Scholar
  29. Hart OD (1982) A model of imperfect competition with Keynesian features. Q J Econ 97:109–138CrossRefGoogle Scholar
  30. Hicks JR (1946) Value and capital, 2nd edn. Oxford University Press, OxfordGoogle Scholar
  31. Jacobsen HJ, Schultz C (1994) On the effectiveness of economic policy when competition is imperfect and expectations are rational. Eur Econ Rev 38:305–327CrossRefGoogle Scholar
  32. Kaas L (1998) Multiplicity of Cournot equilibria and involuntary unemployment. J Econ Theory 80:332–349CrossRefGoogle Scholar
  33. Kaas L (2001) Indeterminacy of intertemporal equilibria under imperfect competition. Econ Theory 17:307–323CrossRefGoogle Scholar
  34. Mankiw NG (1985) Small menu costs and large business cycles: a macroeconomic model of monopoly. Q J Econ 100:529–537CrossRefGoogle Scholar
  35. Mankiw NG (1988) Imperfect competition and the Keynesian cross. Econ Lett 26:7–13CrossRefGoogle Scholar
  36. Neary JP, Stiglitz JE (1983) Towards a reconstruction of Keynesian economics: expectations and constrained equilibria. Q J Econ 98(Suppl):199–228CrossRefGoogle Scholar
  37. Obstfeld M, Rogoff K (1995) Exchange rate dynamics redux. J Polit Econ 103:624–660CrossRefGoogle Scholar
  38. Patinkin D (1956) Money, interest and prices. Harper and Row, New YorkGoogle Scholar
  39. Rankin N (1992) Imperfect competition, expectations and the multiple effects of monetary growth. Econ J 102:743–753CrossRefGoogle Scholar
  40. Rankin N (1995) Money in Hart’s model of imperfect competition. Eur J Polit Econ 11:557–575CrossRefGoogle Scholar
  41. Rotemberg JJ, Woodford M (1995) Dynamic general equilibrium models with imperfectly competitive product markets. In: Cooley T (ed) Modern business cycle theory. Princeton University Press, PrincetonGoogle Scholar
  42. Sargent TJ (1993) Bounded rationality in macroeconomics. Clarendon Press, OxfordGoogle Scholar
  43. Sargent TJ, Wallace N (1976) Rational expectations and the theory of economic policy. J Monet Econ 2:169–183CrossRefGoogle Scholar
  44. Schultz C (1992) The impossibility of involuntary unemployment in an overlapping-generations model with rational expectations. J Econ Theory 58(58):61–76CrossRefGoogle Scholar
  45. Silvestre J (1993) The market-power foundations of macroeconomic policy. J Econ Lit 31:105–141Google Scholar
  46. Silvestre J (1995) Market power in macroeconomic models: new developments. Annales d’Economie et de Statistique 37/38:319–356Google Scholar
  47. Startz R (1989) Monopolistic competition as a foundation for Keynesian macroeconomic models. Q J Econ 104:737–752CrossRefGoogle Scholar
  48. Svensson L (1986) Sticky goods prices, flexible asset prices, monopolistic competition and monetary policy. Rev Econ Stud 53:385–405CrossRefGoogle Scholar
  49. Taylor J (1979) Staggered wage setting in a macro model. Am Econ Rev 69:108–113Google Scholar
  50. Weitzman ML (1982) Increasing returns and the foundations of unemployment theory. Econ J 92:787–804CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  1. 1.Department of EconomicsUniversity of WarwickCoventryUK

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