# Diary of Econ 704, Spring 22, 2nd Session

## 14. Apr 27 An Endogenous Growth Model and a Model with Small Businesses

- We finish the Epi-Macro model we talk about endogenous growth and a model with small businesses. We finish the course.

## 13. Apr 25 Extreme Value Shocks and Macro and Pandemics

- We look at what are extreme value shocks and how they should be used in Macro.
- We start with an Epi-Macro model

## 12. Apr 20 More on New Keynesian Models

I name this paper for alternative preferences with interesting properties. We discuss Calvo and Rottemberg pricing.

## 11. Apr 18 Other Issues in Aiyagari Type Economies

We look at entrepreneurs in Aiyagari Economies. We look at unsecured debt. We start looking at monopolistic competition.

## 10. Apr 14 (at noon in 200)

We look at the Aiyagari Economy and Policy Changes, Welfare and Business cycles in this Economy. We look at search.

## 9. Apr 11 Computation of MIT shocks and the Farmer's problem

We apply the Boppart et al to the standard Social planner Model. We start looking at the farmer's problem with shocks and linear technology. We also look at the Huggett economy.

## 8. Apr 6 Midterm

## 7. Apr 4 Finish Industry Equilibria

We look at endogenous entry and exit, stationary equilibrium, adjustment costs. We talk about non-stationary equilibrium. We start the Boppart et al MIT shock approximation.

## 6. Mar 31 Industry Equilibria

We start measure theory. We go over industry equilibria using the notions of measure theory.

## 5. Mar 30 Endogenous Productivity: The Lucas tree economy with search frictions and Competitive Search. Measure Theory.

We finish Competitive Search.

### March 28 Class Postponed to March 31

## 4. Mar 23 Lucas Trees Economies: Preference and Productivity Shocks. Beginning of endogenous Productivity.

- We use no arbitrage conditions to price all kind of securities. We discuss the role of Preference Shocks. We start endogenous productivity and competitive search.

## 3. Mar 21 Economies with Distortions and Heterogeneity

- We talk about other types of heterogeneity (skills) and move into a two country economy. We start the Lucas tree. We look at Lucas trees and derive a pricing condition.

## 2. Mar 16 Recursive Equilibria without and with Distortions

- I go very fast over RCE equilibrium. First an optimal one. Then a few that are not optimal: We pose a government that spends.
- We describe equilibrium of economies where the welfare theorems are of no use: a government financing a public good with capital income taxes.
- We discuss an environment with capital income taxation and government debt. We talk about the economy with a stock market. We talk about various forms of habits and/or externalities in consumption. We start talking about economies with heterogeneity, starting with wealth.

## 1. Mar 14 Intro

- I describe the course and discussed some context of what are the
main facts over which macro has to be organized around:
- output per capita has grown at a roughly constant rate
- the capital-output ratio has remained roughly constant (where capital is measured using the perpetual inventory method based on past consumption foregone)
- the capital-labor ratio has grown at a roughly constant rate equal to the growth rate of output
- the wage rate has grown at a roughly constant rate equal to the growth rate of output
- the real interest rate has been stationary and, during long periods, roughly constant
- labor income as a share of output has remained roughly constant
- hours worked per capita have been roughly constant.

- I discuss what restrictions do these facts pose on the models that we use.
- I discuss some of the limitations of this point of view.

- I discuss what is the meaning of an equilibrium (a mapping from environment to allocations)