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The government behavioural constraint in rational expectations models

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<mark>Journal publication date</mark>1982
<mark>Journal</mark>Economics Letters
Issue number3
Number of pages7
Pages (from-to)221-227
Publication StatusPublished
<mark>Original language</mark>English


Models with rationalexpectations typically include state variables whose values are controlled by the government. Hence, the need to specify behavioural rules for the authorities. Our purpose is to show, in the context of a well-known Cagan type model of the demand for money, that the assumption of rationalexpectations imposes the hitherto neglected requirement of rationality of the postulated behaviour of government. In particular the occurance of non-unique solutions highlights the need for a rational choice between these on grounds other than mathematical convenience or ad hoc economic assumptions of minimum variance, terminal conditions etc.