From 313cd7a57be81d9a360ec039ed835be06b6e8c65 Mon Sep 17 00:00:00 2001 From: John Stachurski Date: Sat, 27 Dec 2025 06:58:40 +0900 Subject: [PATCH] Fix grammar and spelling errors across lecture files MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit - ar1_processes.md: Fix missing asterisk in math notation - business_cycle.md: Fix preposition usage and grammar - cagan_adaptive.md: Fix subject-verb agreement - long_run_growth.md: Remove redundant word and improve word choice - lp_intro.md: Fix markdown formatting - supply_demand_heterogeneity.md: Fix article usage - tax_smooth.md: Remove duplicate word and extra word - unpleasant.md: Clarify pronoun reference đŸ¤– Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 --- lectures/ar1_processes.md | 2 +- lectures/business_cycle.md | 4 ++-- lectures/cagan_adaptive.md | 4 ++-- lectures/long_run_growth.md | 4 ++-- lectures/lp_intro.md | 2 +- lectures/supply_demand_heterogeneity.md | 2 +- lectures/tax_smooth.md | 4 ++-- lectures/unpleasant.md | 2 +- 8 files changed, 12 insertions(+), 12 deletions(-) diff --git a/lectures/ar1_processes.md b/lectures/ar1_processes.md index 34b93ae7c..1a041a526 100644 --- a/lectures/ar1_processes.md +++ b/lectures/ar1_processes.md @@ -356,7 +356,7 @@ In this equation, we can use observed data to evaluate the left hand side of {eq And we can use a theoretical AR(1) model to calculate the right hand side. -If $\frac{1}{m} \sum_{t = 1}^m X_t$ is not close to $\psi^(x)$, even for many +If $\frac{1}{m} \sum_{t = 1}^m X_t$ is not close to $\psi^*(x)$, even for many observations, then our theory seems to be incorrect and we will need to revise it. diff --git a/lectures/business_cycle.md b/lectures/business_cycle.md index 5e7174bb4..89f72d7f8 100644 --- a/lectures/business_cycle.md +++ b/lectures/business_cycle.md @@ -211,7 +211,7 @@ plt.show() GDP growth is positive on average and trending slightly downward over time. -We also see fluctuations over GDP growth over time, some of which are quite large. +We also see fluctuations in GDP growth over time, some of which are quite large. Let's look at a few more countries to get a basis for comparison. @@ -608,7 +608,7 @@ perspectives: consumption, production, and credit level. ### Consumption -Consumption depends on consumers' confidence towards their +Consumption depends on consumers' confidence in their income and the overall performance of the economy in the future. One widely cited indicator for consumer confidence is the [consumer sentiment index](https://fred.stlouisfed.org/series/UMCSENT) published by the University diff --git a/lectures/cagan_adaptive.md b/lectures/cagan_adaptive.md index f3d48c34c..db4335a9b 100644 --- a/lectures/cagan_adaptive.md +++ b/lectures/cagan_adaptive.md @@ -437,8 +437,8 @@ We invite you to explain to yourself the source of this overshooting and why it ### Experiment 2 -Now we'll do a different experiment, namely, a gradual stabilization in which the rate of growth of the money supply smoothly -decline from a high value to a persistently low value. +Now we'll do a different experiment, namely, a gradual stabilization in which the rate of growth of the money supply smoothly +declines from a high value to a persistently low value. While price level inflation eventually falls, it falls more slowly than the driving force that ultimately causes it to fall, namely, the falling rate of growth of the money supply. diff --git a/lectures/long_run_growth.md b/lectures/long_run_growth.md index d9a5ef577..e21bee1c0 100644 --- a/lectures/long_run_growth.md +++ b/lectures/long_run_growth.md @@ -57,7 +57,7 @@ These graphs will portray how the "Industrial Revolution" began in Britain in th In a nutshell, this lecture records growth trajectories of various countries over long time periods. -While some countries have experienced long-term rapid growth across that has lasted a hundred years, others have not. +While some countries have experienced long-term rapid growth that has lasted a hundred years, others have not. Since populations differ across countries and vary within a country over time, it will be interesting to describe both total GDP and GDP per capita as it evolves within a country. @@ -181,7 +181,7 @@ gdp_pc[country].plot( [International dollars](https://en.wikipedia.org/wiki/international_dollar) are a hypothetical unit of currency that has the same purchasing power parity that the U.S. Dollar has in the United States at a given point in time. They are also known as Geary–Khamis dollars (GK Dollars). ::: -We can see that the data is non-continuous for longer periods in the early 250 years of this millennium, so we could choose to interpolate to get a continuous line plot. +We can see that the data is incomplete for longer periods in the early 250 years of this millennium, so we could choose to interpolate to get a continuous line plot. Here we use dashed lines to indicate interpolated trends diff --git a/lectures/lp_intro.md b/lectures/lp_intro.md index 102ad4fd9..52504a5aa 100644 --- a/lectures/lp_intro.md +++ b/lectures/lp_intro.md @@ -34,7 +34,7 @@ Linear programs come in pairs: If a primal problem involves *maximization*, the dual problem involves *minimization*. -If a primal problem involves *minimization**, the dual problem involves **maximization*. +If a primal problem involves *minimization*, the dual problem involves *maximization*. We provide a standard form of a linear program and methods to transform other forms of linear programming problems into a standard form. diff --git a/lectures/supply_demand_heterogeneity.md b/lectures/supply_demand_heterogeneity.md index 347294bea..2672cda12 100644 --- a/lectures/supply_demand_heterogeneity.md +++ b/lectures/supply_demand_heterogeneity.md @@ -36,7 +36,7 @@ import numpy as np from scipy.linalg import inv ``` -## An simple example +## A simple example Let's study a simple example of **pure exchange** economy without production. diff --git a/lectures/tax_smooth.md b/lectures/tax_smooth.md index 0ba1095ff..128541de3 100644 --- a/lectures/tax_smooth.md +++ b/lectures/tax_smooth.md @@ -19,7 +19,7 @@ kernelspec: This is a sister lecture to our lecture on {doc}`consumption-smoothing `. -By renaming variables, we obtain a version of a model "tax-smoothing model" that Robert Barro {cite}`Barro1979` used to explain why governments sometimes choose not to balance their budgets every period but instead use issue debt to smooth tax rates over time. +By renaming variables, we obtain a version of a model "tax-smoothing model" that Robert Barro {cite}`Barro1979` used to explain why governments sometimes choose not to balance their budgets every period but instead issue debt to smooth tax rates over time. The government chooses a tax collection path that minimizes the present value of its costs of raising revenue. @@ -49,7 +49,7 @@ from collections import namedtuple A government exists at times $t=0, 1, \ldots, S$ and faces an exogenous stream of expenditures $\{G_t\}_{t=0}^S$. -It chooses chooses a stream of tax collections $\{T_t\}_{t=0}^S$. +It chooses a stream of tax collections $\{T_t\}_{t=0}^S$. The model takes a government expenditure stream as an "exogenous" input that is somehow determined outside the model. diff --git a/lectures/unpleasant.md b/lectures/unpleasant.md index 0891036c0..2edde85eb 100644 --- a/lectures/unpleasant.md +++ b/lectures/unpleasant.md @@ -36,7 +36,7 @@ by printing money at times $t \geq T$. These outcomes are the essential finding of Sargent and Wallace's "unpleasant monetarist arithmetic" {cite}`sargent1981`. -That lecture described supplies and demands for money that appear in lecture. +That lecture described supplies and demands for money that appear in that lecture. It also characterized the steady state equilibrium from which we work backwards in this lecture.