Lecture 25: Investment - II. After studying this chapter you will be able to understand: Things that shift the investment function, why investment rises during booms and falls during recessions. | Review of the previous lecture All types of investment depend negatively on the real interest rate. Things that shift the investment function: Technological improvements raise MPK and raise business fixed investment. Increase in population raises demand for, price of housing and raises residential investment. Economic policies (corporate income tax, investment tax credit) alter incentives to invest. 0 Lecture 25 Investment - II Instructor: Prof. Dr. Qaisar Abbas 1 This chapter sets up the IS-LM model, which chapter 11 then uses extensively to analyze the effects of policies and economic shocks. This chapter also introduces students to the Keynesian Cross and Liquidity Preference models, which underlie the IS curve and LM curve, respectively. If you would like to spend less time on this chapter, you might consider omitting the Keynesian Cross, instead using the loanable funds model from Chapter 3 to derive the IS curve. Advantage: students are already familiar with the loanable funds . | Review of the previous lecture All types of investment depend negatively on the real interest rate. Things that shift the investment function: Technological improvements raise MPK and raise business fixed investment. Increase in population raises demand for, price of housing and raises residential investment. Economic policies (corporate income tax, investment tax credit) alter incentives to invest. 0 Lecture 25 Investment - II Instructor: Prof. Dr. Qaisar Abbas 1 This chapter sets up the IS-LM model, which chapter 11 then uses extensively to analyze the effects of policies and economic shocks. This chapter also introduces students to the Keynesian Cross and Liquidity Preference models, which underlie the IS curve and LM curve, respectively. If you would like to spend less time on this chapter, you might consider omitting the Keynesian Cross, instead using the loanable funds model from Chapter 3 to derive the IS curve. Advantage: students are already familiar with the loanable funds model, so skipping the KC means one less model to learn. Additionally, the KC model is not used anywhere else in this textbook. Once it’s used to derive IS, it disappears for good. However, there are some good reasons for NOT omitting the KC model: 1) Many principles textbooks (though not Mankiw’s) cover the KC model; students who learned the KC model in their principles class may benefit from seeing it here, as a bridge to new material (the IS curve). 2) The KC model has historical value. One could argue that somebody graduating from college with a degree in economics should be familiar with the KC model. Lecture Contents Things that shift the investment function Why investment rises during booms and falls during recessions 2 Tobin’s q numerator: the stock market value of the economy’s capital stock denominator: the actual cost to replace the capital goods that were purchased when the stock was issued If q > 1, firms buy more capital to raise the market value of their firms If q < 1, .
