1. ) advocates a "minimum state variable criterion," which he relates to learnability. These refinements go beyond the standard definitions of economic equilibria. One may argue that when a model gives multiple equilibria, we need additional selection criteria;Honkapohja;) advocate criteria based on least-squares learnability, and McCallum,2001
2. Unique monetary equilibria with interest rate rules
3. Price-Level Determinacy, Lower Bounds on the Nominal Interest Rate, and Liquidity Traps;Ragna Alstadheim;The B.E. Journal of Macroeconomics,2006