GDP accounting. GDP: market value of all newly produced goods and services produced in a given location in a specific time period
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1 IS Curve
2 GDP accounting GDP: market value of all newly produced goods and services produced in a given location in a specific time period
3 GDP accounting GDP: market value of all newly produced goods and services produced in a given location in a specific time period Income = expenditures
4 GDP accounting GDP: market value of all newly produced goods and services produced in a given location in a specific time period Income = expenditures Y = C + I + G + NX
5 GDP accounting GDP: market value of all newly produced goods and services produced in a given location in a specific time period Income = expenditures Y = C + I + G + NX C: consumption expenditures
6 GDP accounting GDP: market value of all newly produced goods and services produced in a given location in a specific time period Income = expenditures Y = C + I + G + NX C: consumption expenditures I: investment expenditures (puurchases of capital)
7 GDP accounting GDP: market value of all newly produced goods and services produced in a given location in a specific time period Income = expenditures Y = C + I + G + NX C: consumption expenditures I: investment expenditures (puurchases of capital) G: government purchases
8 GDP accounting GDP: market value of all newly produced goods and services produced in a given location in a specific time period Income = expenditures Y = C + I + G + NX C: consumption expenditures I: investment expenditures (puurchases of capital) G: government purchases N X: net exports (exports imports)
9 Consumption depends on income More income more consumption
10 Consumption depends on income More income more consumption Some amount of consumption is independent of income
11 Consumption depends on income More income more consumption Some amount of consumption is independent of income C = C(Y ) = C + mpc Y Consumption C Income, Y
12 In groups Y = C + I + G C = C + mpc Y 1. Solve the two equations for Y 2. If the government buys $100 more stuff, 2.1 How much does Y increase? 2.2 Calculate Y/ G, the government spending multiplier 2.3 Why does Y increase by more than $100?
13 IS curve shift from change in G Y G
14 IS curve shift from change in G Y G G
15 IS curve shift from change in G Y G G C =
16 IS curve shift from change in G Y G G C = mpc G
17 IS curve shift from change in G Y G G C = mpc G mpc G
18 IS curve shift from change in G Y G G C = mpc G mpc G C =
19 IS curve shift from change in G Y G G C = mpc G mpc G C = mpc mpc G
20 IS curve shift from change in G Y G G C = mpc G mpc G C = mpc mpc G mpc 2 G
21 IS curve shift from change in G Y G G C = mpc G mpc G C = mpc mpc G mpc 2 G C =
22 IS curve shift from change in G Y G G C = mpc G mpc G C = mpc mpc G mpc 2 G C = mpc mpc 2 G
23 IS curve shift from change in G Y G G C = mpc G mpc G C = mpc mpc G mpc 2 G C = mpc mpc 2 G mpc 3 G
24 IS curve shift from change in G Y G G C = mpc G mpc G C = mpc mpc G mpc 2 G C = mpc mpc 2 G mpc 3 G C = mpc mpc 3 G mpc 4 G..
25 IS curve shift from change in G Y G G C = mpc G mpc G C = mpc mpc G mpc 2 G C = mpc mpc 2 G mpc 3 G C = mpc mpc 3 G mpc 4 G Total: Y = 1 1 mpc G..
26 Government behavior G = G T = T ty Taxes reduce disposable income so that C = C + mpc ( Y T ty ) = C + mpc ( (1 t) Y T )
27 IS curve shift from change in T Y T
28 IS curve shift from change in T Y T 0
29 IS curve shift from change in T Y T 0 C =
30 IS curve shift from change in T Y T 0 C = mpc T
31 IS curve shift from change in T Y T 0 C = mpc T mpc T
32 IS curve shift from change in T Y T 0 C = mpc T mpc T C =
33 IS curve shift from change in T Y T 0 C = mpc T mpc T C = mpc mpc T
34 IS curve shift from change in T Y T 0 C = mpc T mpc T C = mpc mpc T mpc 2 T
35 IS curve shift from change in T Y T 0 C = mpc T mpc T C = mpc mpc T mpc 2 T C = mpc mpc 2 T mpc 3 T C = mpc mpc 3 T mpc 4 T..
36 IS curve shift from change in T Y T 0 C = mpc T mpc T C = mpc mpc T mpc 2 T C = mpc mpc 2 T mpc 3 T C = mpc mpc 3 T mpc 4 T.. Total: Y = mpc 1 mpc T
37 Investment and interest rates What is the opportunity cost of investment?
38 Investment and interest rates What is the opportunity cost of investment? r Cost of borrowing to buy capital Cost of not using funds to buy bonds
39 Investment and interest rates What is the opportunity cost of investment? r Cost of borrowing to buy capital Cost of not using funds to buy bonds I = I (r)
40 Investment and interest rates What is the opportunity cost of investment? r Cost of borrowing to buy capital Cost of not using funds to buy bonds I = I (r) Also includes autonomous investment I
41 Investment and interest rates What is the opportunity cost of investment? r Cost of borrowing to buy capital Cost of not using funds to buy bonds I = I (r) Also includes autonomous investment I Ex: I = I dr
42 Investment and interest rates What is the opportunity cost of investment? r Cost of borrowing to buy capital Cost of not using funds to buy bonds r I = I (r) Also includes autonomous investment I Ex: I = I dr Investment demand Investment
43 IS Curve Y = C + I + G + NX C = C + mpc ( (1 t) Y T ) I = I dr G = G
44 IS Curve Y = C + I + G + NX C = C + mpc ( (1 t) Y T ) I = I dr G = G What is exogenous?
45 IS Curve Y = C + I + G + NX C = C + mpc ( (1 t) Y T ) I = I dr G = G What is exogenous? What is endogenous?
46 IS Curve Y = C + I + G + NX C = C + mpc ( (1 t) Y T ) I = I dr G = G What is exogenous? What is endogenous? Y = C + mpc ( (1 t) Y T ) + I dr + G
47 IS Curve Y = C + I + G + NX C = C + mpc ( (1 t) Y T ) I = I dr G = G What is exogenous? What is endogenous? Y = C + mpc ( (1 t) Y T ) + I dr + G Y = C + mpc (1 t) Y mpct + I dr + G
48 IS Curve Y = C + I + G + NX C = C + mpc ( (1 t) Y T ) I = I dr G = G What is exogenous? What is endogenous? Y = C + mpc ( (1 t) Y T ) + I dr + G Y = C + mpc (1 t) Y mpct + I dr + G Y mpc (1 t) Y = C mpct + I dr + G
49 IS Curve Y = C + I + G + NX C = C + mpc ( (1 t) Y T ) I = I dr G = G What is exogenous? What is endogenous? Y = C + mpc ( (1 t) Y T ) + I dr + G Y = C + mpc (1 t) Y mpct + I dr + G Y mpc (1 t) Y = C mpct + I dr + G (1 mpc (1 t)) Y = C mpct + I + G dr
50 IS Curve Y = C + I + G + NX C = C + mpc ( (1 t) Y T ) I = I dr G = G What is exogenous? What is endogenous? Y = C + mpc ( (1 t) Y T ) + I dr + G Y = C + mpc (1 t) Y mpct + I dr + G Y mpc (1 t) Y = C mpct + I dr + G (1 mpc (1 t)) Y = C mpct + I + G dr Y = 1 [ ] d C mpct + I + G 1 mpc (1 t) 1 mpc (1 t) r
51 1. Graph the IS curve (Y on horizontal, r on vertical) 2. True or false: since an increase in income increases consumption, this will shift the IS curve up 3. Show how an increase in the marginal propensity to consume changes the slope of the IS curve. 4. What will happen to the IS curve if taxes and government spending both rise by the same amount? 5. Show what will happen to incomes if people become more confident about their future wealth and interest rates do not change. What does this tell you about a possible cause of recessions? 6. What will happen to the IS curve if the marginal product of capital increases? 7. How can you modify the IS curve to account for the fact that firms trying to finance capital purchases face costs that are higher than the Federal Funds Rate? When will this modification be most important?
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