On the Indeterminacy of Determinacy and Indeterminacy
A number of authors have attempted to test whether the US economy is in a determinate or an indeterminate equilibrium. We argue that to answer this question, one must impose a priori restrictions on lag length that cannot be tested. We provide examples of two economic models. Model 1 displays an indeterminate equilibrium, driven by sunspots. Model 2 displays a determinate equilibrium driven by fundamentals. Both models have the same likelihood function and are therefore observationally equivalent.
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|Date of creation:||Oct 2003|
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