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Copy file name to clipboardExpand all lines: lectures/money_inflation_nonlinear.md
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## Overview
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We study stationary and dynamic *Laffer curves* in the inflation tax rate in a non-linear version of the model studied in this lecture {doc}`money_inflation`.
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We study stationary and dynamic *Laffer curves* in the inflation tax rate in a non-linear version of the model studied in {doc}`money_inflation`.
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We use the log-linear version of the demand function for money that {cite}`Cagan`
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used in his classic paper in place of the linear demand function used in this lecture {doc}`money_inflation`.
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used in his classic paper in place of the linear demand function used in {doc}`money_inflation`.
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That change requires that we modify parts of our analysis.
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In particular, our dynamic system is no longer linear in state variables.
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Nevertheless, the economic logic underlying an analysis based on what we called ''method 2'' remains unchanged.
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We shall discover qualitatively similar outcomes to those that we studied in the lecture {doc}`money_inflation`.
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We shall discover qualitatively similar outcomes to those that we studied in {doc}`money_inflation`.
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That lecture presented a linear version of the model in this lecture.
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* perverse dynamics under rational expectations in which the system converges to the higher stationary inflation tax rate
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* a peculiar comparative stationary-state analysis connected with that stationary inflation rate that assert that inflation can be *reduced* by running *higher* government deficits
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These outcomes will set the stage for the analysis of this lecture {doc}`laffer_adaptive` that studies a version of the present model that uses a version of "adaptive expectations" instead of rational expectations.
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These outcomes will set the stage for the analysis of {doc}`laffer_adaptive` that studies a version of the present model that uses a version of "adaptive expectations" instead of rational expectations.
We are now equipped to compute time series starting from different $p_0$ settings, like those in this lecture {doc}`money_inflation`.
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We are now equipped to compute time series starting from different $p_0$ settings, like those in {doc}`money_inflation`.
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```{code-cell} ipython3
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:tags: [hide-cell]
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* the figure indicates that inflation can be *reduced* by running *higher* government deficits, i.e., by raising more resources through printing money.
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```{note}
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The same qualitive outcomes prevail in this lecture {doc}`money_inflation` that studies a linear version of the model in this lecture.
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The same qualitive outcomes prevail in {doc}`money_inflation` that studies a linear version of the model in this lecture.
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```
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We discovered that
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* all but one of the equilibrium paths converge to limits in which the higher of two possible stationary inflation tax prevails
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* there is a unique equilibrium path associated with "plausible" statements about how reductions in government deficits affect a stationary inflation rate
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As in this lecture {doc}`money_inflation`,
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As in {doc}`money_inflation`,
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on grounds of plausibility, we again recommend selecting the unique equilibrium that converges to the lower stationary inflation tax rate.
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As we shall see, we accepting this recommendation is a key ingredient of outcomes of the "unpleasant arithmetic" that we describe in lecture {doc}`unpleasant`.
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As we shall see, we accepting this recommendation is a key ingredient of outcomes of the "unpleasant arithmetic" that we describe in {doc}`unpleasant`.
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In lecture, {doc}`laffer_adaptive`, we shall explore how {cite}`bruno1990seigniorage` and others justified our equilibrium selection in other ways.
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In {doc}`laffer_adaptive`, we shall explore how {cite}`bruno1990seigniorage` and others justified our equilibrium selection in other ways.
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