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 FOOTNOTES


1. Numerous other varying, switching, or random parameter structures
 may be hypothesized, however, the present treatment is attractive
 because of its generality.

2. The stacking scheme presented simply permits the treatment of
 all equations jointly. Given a recursive system, single equation
 methods would yield identical results.

3. Alternatively,it could be assumed that the way in which expectations
 are formulated varies over time. Or, it could be argued that the
 model is mispecified in terms of incorporating expectations appro-
 priately.