This chapter reviews the issue of equilibrium indeterminacy in macroeconomics. Instead of providing a broad literature survey, we consider two simple examples. One is a univariable rational expectations model of asset price determination. The other is a general equilibrium model of monetary economy. When discussing both examples, we classify the models into three categories: the steady state of the model economy is (i) unique, (ii) multiple, and (iii) a continuum. The majority of foregoing studies have treated models with a unique steady state. However, there are some interesting situations in which multiple steady state equilibria exist or the steady state of the economy constitutes a continuum.
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