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- From: jmo@stokes.princeton.edu (Mike Orszag)
- Newsgroups: sci.econ
- Subject: Re: RBC Modelling
- Message-ID: <1992Sep1.204130.7078@Princeton.EDU>
- Date: 1 Sep 92 20:41:30 GMT
- References: <92242.220031ECOKXP@BYUVM.BITNET> <thompson.715272635@daphne.socsci.umn.edu>
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- In article <thompson.715272635@daphne.socsci.umn.edu>, thompson@atlas.socsci.umn.edu (T. Scott Thompson) writes:
- |> <ECOKXP@BYUVM.BITNET> writes:
- |>
- |> >Well, perhaps to start a new thread, perhaps to fail...
- |>
- |> >What is the perception out there in netland about the validity of
- |> >Real Business Cycle models? Do they give us a reasonable and
- |> >useful description of the macroeconomy? Does money matter?
- |>
- |> Depends on what you mean by "validity" since no model is perfect in
- |> all respects. Some of the current "state of the art" work on real
- |> business cycles gets pretty good fits to some low order moments of the
- |> business cycle variables by simply hypothesizing that the economy is
- |> hit frequently by random "technology shocks" or "productivity shocks."
- |> It is hypothesized by some that these are fundamental forces behind
- |> the cyclical behavior of things like GDP and employment.
- |>
- |> Unless you are good at forecasting the next technology shock you will
- |> not find this kind of result very useful for prediction, however.
- |>
- |> About two years ago I heard a lecture by Martin Eichenbaum of
- |> Northwestern University about a model that extended the "technology
- |> shock" models to allow for a simultaneous role for unanticipated
- |> changes in the money supply. He claimed that the data are unable to
- |> sort out whether the unanticipated monetary shocks or the technology
- |> shocks are dominant forces behind the real business cycle.
- |> --
- |> T. Scott Thompson email: thompson@atlas.socsci.umn.edu
- |> Department of Economics phone: (612) 625-0119
- |> University of Minnesota fax: (612) 624-0209
-
-
- The RBC models use assumptions based on observed macroeconomic
- data (Cobb-Douglas production function, etc.) and are calibrated
- with macroeconomic data. It would be very surprising if such
- models did not match the data very closely.
-
- There is no indication that the "technological shocks" of RBC models
- have anything to do with real technological innovation; I think
- they are connected with various real rigidities which are in any
- case indistinguishable from technological shocks even at the
- microeconomic level.
-
- -- MIKE ORSZAG
- Department of Economics
- University of Michigan
-