# It includes the following areas:

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It includes the following areas:
Keynesian Theory of Income Determination : two-sector model using AE=AS Approach This courseware is designed for revision purposes after finishing the above topic. It includes the following areas: 13 power point presentations 1 excel worksheet for interactive construction 10 multiple choice questions (4 options)

Coursework(Sec1-39-11) by s.w. Leung
Keynesian Theory of Income Determination : two-sector model using AE = AS Approach Coursework(Sec ) by s.w. Leung

Assumptions in NI Models
a single concept of NI (Y) a constant level of potential income (Yf) existence of unemployment constant price level i.e. Y=Q since P=1

Two-sector model --- Keynesian
Circular flow diagram E(AE) : Aggregate expenditure Y(NI) : National income Next section

Two sectors : Household & Firm
Circular flow diagram Two sectors : Household & Firm C National Income Household National Expenditure S Financial market C : consumption I S : saving I : investment Y : Income generated E : Payments for goods & services Y Firm E

E (AE) : Aggregate expenditure
In a two-sector economy, firms (F) produce consumption goods (C) and investment goods (I) , that means expenditure (E) in the economy is on either C or I ; and we get an income-generated function. E = C + I

Y(NI) : National income
On the other hand, income (Y) received by households (H) is either consumed (C) or saved (S). To complete the flow of income and expenditure, E = Y, we get the equilibrium income (Ye).

A graphical approach (AE = AS) to income determination
E function and Y-line component of AE simple algebra of income determination construction

E function and Y-line E function E(AE) : Demand side E = C + I
Y(AS) : Supply side Y E Y-line(450) E = Y Construct a Y-line (450) : shows all the points where E equals Y Y E = Y = Q (re: assumption P=1) (E) expenditure in the economy equals (Y) income generated by producing (Q) output

Component of AE Consumption function : Cf Investment function : I
Cf = C + cY a function of Yd (in a two-sector model Y = Yd) C : intercept on E-axis (amount consumed when income is zero) c : slope of Cf (c is the marginal propensity to consume) Investment function : I I : an autonomous function (doesn’t vary with Y) Aggregate expenditure function (E or AE) E = C + I a function of Y

Simple algebra of income determination
Solution : E = C + I E = Y + 40 = Y In equilibrium E = Y(Ye) Y = Y 0.4Y = 120 Y = 300 and C = (300) = 260 Given : C = Y I = 40 Find Ye

construction Let’s take C = Y and I = 40 to find Ye graphically An excel worksheet (sheet 1) will be used to illustrate. next

Multiple Choice Exercise MCdemo25.htm demo1.wmf
You come to the END !!!

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