A Dynamic IS-LM Model with Adaptive Expectations

11 Pages Posted: 23 Jun 2008

See all articles by Moisa Altar

Moisa Altar

Bucharest Academy of Economic Studies

Date Written: June, 23 2008


We analyze the stability of a discrete-time dynamic model with an IS-LM structure. We assume that the Aggregate Supply function is of Lucas type, and the monetary policy rule is of Friedman type. The mechanism of expectations formation is assumed to be of adaptive type (Friedman-Cagan). In its final form, the model contains two state variables, namely money supply and expected inflation. From the mathematical point of view, it is an affine discrete-time system, whose stability properties are analyzed in the paper.

We deduce sufficient conditions concerning the "learning coefficient" involved in the Friedman-Cagan type of forecast equation, so that the model is stable.

Keywords: steady state, Lucas type AS function, Friedman type monetary policy rule, stability conditions

JEL Classification: A10, C02, D50, E00, E12, E30

Suggested Citation

Altar, Moisa, A Dynamic IS-LM Model with Adaptive Expectations (June, 23 2008). Available at SSRN: https://ssrn.com/abstract=1150178 or http://dx.doi.org/10.2139/ssrn.1150178

Moisa Altar (Contact Author)

Bucharest Academy of Economic Studies ( email )

6, Romana Square, District 1
Bucharest, 010374

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