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Слайды и текст этой презентации

Слайд 1

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Intermediate Macroeconomics Chapter 4 Introduction to the Equilibrium Model

Слайд 2

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Introduction to the Equilibrium Model The Parsimonious Model What is an Equilibrium Model? Equilibrium Model Solution Method Simple Equilibrium Model in Action

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The Parsimonious Model Make simplifying assumptions Parsimonious – stingy, miserly Occam’s Razor - eliminate complicating details that don’t significantly contribute to the model Don’t include unimportant variables Ceteris Paribus (other things being equal) - Hold constant variables that are not the focus of your interest

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The Parsimonious Model Simplifying assumptions for our models Aggregate output ≡ National income National income ≡ Personal income

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What is an Equilibrium Model? Assumed equilibrium condition GDP Accounting (Chapter 2): National Income ≈ Aggregate Supply Macroeconomic Models: Aggregate Supply (AS) = Aggregate Demand (AD) or National Income (Y) = Aggregate Demand (AD)

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What is an Equilibrium Model? Disequilibrium Disequilibrium: aggregate output (or national income) is not equal to aggregate demand Undesired Inventory Accumulation: a symptom of disequilibrium where aggregate output > aggregate demand Undesired Inventory Draw: a symptom of disequilibrium where aggregate output < aggregate demand

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3. Equilibrium Model Solution Method 1. Substitute the given equations into the equation for aggregate demand AD. 2. Apply the assumed equilibrium condition: Y = AD 3. Substitute the derived equation for AD from step 1 into the right-hand side of the equilibrium condition in step 2. 4. Simplify the equation. This often means solving for income (Y), since Y should appear on both the left- and right-hand sides of the equation in step 3.

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4. Simple Equilibrium Model in Action Describing the economy AD = C + I + G + NX AD = aggregate demand C = consumption I = investment D = government spending NX = net exports (exports – imports) YD = C + S YD = disposable income S = savings YD = Y + TR – TA Y = national income TR = government transfer payments TA = government taxes

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4. Simple Equilibrium Model in Action Solving the model 1. Substitute given equations into equation for AD: YD = YD C + S = Y + TR – TA C = Y + TR – TA - S AD = C + I + G + NX = (Y + TR - TA - S) + I + G + NX 2. Apply equilibrium condition: Y = AD 3. Substitute solution for AD from Step 1: Y = Y + TR - TA - S + I + G + NX Simplify equation: G + TR - TA = S - I - NX

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4. Simple Equilibrium Model in Action Implications of the model In equilibrium: G + TR - TA = S - I - NX Crowding Out Ricardian Equivalence Twin Deficits

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4. Simple Equilibrium Model in Action Crowding Out In equilibrium: G + TR - TA = S - I - NX Assume: Increase in government deficit (G + TR - TA) Savings (S) and net exports (NX) constant Result: Decrease in investment (I)

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4. Simple Equilibrium Model in Action Ricardian Equivalence In equilibrium: G + TR - TA = S - I - NX Assume: Increase in government deficit (G + TR - TA) Investment (I) and net exports (NX) constant Result: Increase in savings (S)

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4. Simple Equilibrium Model in Action Twin Deficits In equilibrium: G + TR - TA = S - I - NX Assume: Increase in government deficit (G + TR - TA) Savings (S) and investment (I) constant Result: Decrease in net exports (NX)