This paper argues against determinacy as a guide to interpret rational expectations solutions, using an example in which a determinate solution exists but differs sharply in dynamic behavior from that implied by the model considered on a sector-by-sector basis.

Ellison and Pearlman (2011) show that determinacy implies e-stability under both full and lagged information if (1) subjective expectations are consistent with a structural model and unbiased, and (2) a learning process is given by the saddlepath relationship. This study clarifies that their...

Under reduced-form learning, agents are endowed with an aggregate model, and rational expectations are then replaced with subjective expectations. This paper demonstrates that the reduced-form learning approach may be arbitrary in that a particular representation of aggregate dynamics has...