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National income

Unit: Economics

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April 2025

2 Questions
Question 7a
​​The following data represents estimated national income of an economy in millions of shillings:

Gross national product (at market prices) 
= 498.5 
Depreciation allowance 
= 56.0 
Indirect taxes less subsidies 
= 52.4 
Business taxes 
= 13.5
Personal income taxes 
= 76.2 
Government transfers 
= 68.2 
Retained profits 
= 15.0 

Required:
Determine the following: 

(i)
Net National Product at market price. 
(ii)
Disposable income. 
(iii)
Personal income. 
(iv)
Net National Income at factor cost. 


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Question 3d
​ ​ ​​Distinguish between the “fiscal multiplier” and the “export multiplier”.


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December 2024

3 Questions
Question 1c
​​(i) Enumerate FOUR causes of a budget deficit in an economy. 

(ii) Highlight FOUR policy measures that could be adopted to correct a budget deficit.


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Question 2a
​​Explain FIVE disadvantages of adopting a dual exchange rate regime in an economy.


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Question 4a
​ ​​The commodity and money market for a certain economy is given by the following functions:

Commodity market

C = 500 + 0.64Y

I = 1720 + 12r

Money market

MS1,400

MDT = 0.5Y

MDS = 600 – 10r 

Required: 

(i) Derive the IS function.

(ii) Derive the LM function.

(iii) Determine the equilibrium rate of interest and equilibrium level of national income. 


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August 2024

3 Questions
Question 3c
​ ​ ​​The following information represents the national income of country X in billions of shillings. 
 
C = 220 + 0.8Yd 
T = 30 + 0.1Y 
I = 70 
G = 20 
 
Where:  C = Consumption expenditure 
 T = Taxes 
 G = Government expenditure 
 Yd = Disposable income 
 
Required: 
(i) The marginal propensity to save.
 
(ii) The multiplier.

(iii) The consumption expenditure. 
 
(iv) The equilibrium level of national income and taxes. 


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Question 7a
​ ​​Using well labelled diagrams, distinguish between “inflationary gap” and “deflationary gap” as used in national income statistics.


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Question 7b
​​Highlight FOUR principles of a good tax system.


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April 2024

3 Questions
Question 3b
​ ​ ​​The following information relates to a given economy:

Marginal prospensity to save (MPS) = 0.2

Autonomous consumption = 400

Required:

(i) Formulate the consumption function. (3 marks)

(ii) Determine the change in National Income if the Government’s expenditure was to increase by 50%.


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Question 6d
​ ​ ​​The following information relate to the national income figures of a certain economy in billions of shillings:

Year
Nominal Gross National Product (GNP)
Real GNP
2000
1,359
1,359
2010
2,857
1,623

Required: 
(i) Determine the GNP implicit price deflator. 

(ii) Calculate the rate of inflation.


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Question 1c
​ ​ ​ ​​Using a well labelled diagram, illustrate the circular flow of income in an open economy with no government interference.


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August 2023

4 Questions
Question 5a
​ ​​The following information relates to a hypothetical economy:

Autonomous consumption = 8000

Marginal propensity to save (MPS) = 0.45

Required:

(i) Derive the savings function.

(ii) If the level of government expenditure increases by 250%, determine the change in equilibrium level of

national income. 


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Question 2a
​​Outline FIVE challenges that economic planners are likely to encounter when using the income approach to estimate the level of national income in least developed countries.


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Question 2b
​​(i) Explain the term “credit creation”. 

(ii) Describe THREE factors that limit the effectiveness of credit creation by commercial banks in your country.


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Question 4c
​​Identify FIVE factors that limit the application of the accelerator principle in an economy.


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April 2023

2 Questions
Question 4a
​ ​​The commodity and money markets for a certain economy is given by the following functions:

Commodity market

C = 400 + 0.45y

I = 1700 + 18r

Money market

MS = 1600

MDT = 0.25y

MDS = 800 – 12r 

Required:

(i) Derive the IS function.

(ii) Derive the LM function.

(iii) Determine the equilibrium rate of interest.

(iv) Determine the equilibrium level of national income. 


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Question 4b
​ ​​Explain the following types of multipliers as used in economics: 

 (i) Investment multiplier. 

(ii) Government multiplier. 

(iii) Export multiplier. 

(iv) Consumption multiplier.


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December 2022

3 Questions
Question 7b
​ ​ ​​The following data relates to the national income of a certain country in billions of shillings:

C = 500 + 0.6Yd

I = 350

G = 250

T = 200

X - M = 280 - 0.1Y

Where:

G = Government expenditure

C = Consumption

I = Investment

T = Taxes

X = Exports

M = Imports

Y = National income

Required:

(i) The equilibrium level of national income.

(ii) The equilibrium level of consumption expenditure.

(iii) The multiplier.


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Question 2b
​​Explain SIX problems that an economist could encounter when comparing welfare between different countries.


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Question 2a
​​ List FOUR components of disposable national income.


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August 2022

1 Questions
Question 6b
​ ​​The data provided below represent the national income model of a certain economy in billions of shillings:

Y = C + I + G + (X – M)

C = 200 + 0.8Yd

T = 20 + 0.2Y

I = 70

G = 50

X = 40

M = 60

Where:

Y = National income

C = Consumption expenditure

I = Investment

G = Government expenditure

Yd = Disposable income

T = Taxes

X = Export

M = Import

Required:

The equilibrium level of:

(i) National income.

(ii) Consumption.

(iii) Taxes. 


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April 2022

3 Questions
Question 5b
​​(i) Explain the term "per capita income". 

 (ii) Enumerate four limitations of using per capita income as a measure of welfare.


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Question 5a
​ ​​The following table shows the level of National income (Y), Consumption (C), Investment (I), Government Spending (G), Exports (X) and Imports (M) of an utopian country for the years 2020 and 2021:

Year
Y
$
C
$
I
$
G
$
X
$
M
$

2020
80,000
?
10,000
40,000
100,000
120,000
2021
90,000
56,000
15,000
34,000
110,000
?

Required: 
Compute the following: 
(i) The level of consumption in the year 2020. 

(ii) The marginal propensity to consume. 

(iii) The level of imports for the year 2021. 

(iv) The marginal propensity to import.


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Question 5c
​​Highlight four factors that limit the effectiveness of the multiplier in developing countries.


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Question 5b
​ ​ ​​Outline the economic policy recommendations that would reduce regional development imbalances developing countries. 

 The table below represents economic transactions for country XYZ in billions of shillings:

Total output
Intermediate purchases 
Agriculture
130
110
Manufacturing
170
145
Services
150
125

Required: 
(i) Calculate the Gross National Product of this economy using the value added approach. 

(ii) If depreciation and indirect taxes equal 8 billion and 7 billion shillings respectively, find the Net Domestic Product both at Market prices and at factor cost. 


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Question 4c
​ ​ ​​You are given the following information about the commodity and Money markets of a closed economy without

government intervention:

The commodity market Consumption function:

C = 50 + 2/5Y

Investment function:

I = 790 – 21r

The Money Market:

Precautionary and Transactions demand for money MDT = 1/6 Y

Speculative demand for money MDS = 1200 -18r

Money supply MS = 1250

Required:

(i) Determine the equilibrium levels of income and interest rate for this economy.

(ii) Using a well labeled diagram, illustrate the equilibrium condition in part (i) above. 


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December 2021

2 Questions
Question 6b
The following data relate to the nominal and real gross national product (GNP) levels for a hypothetical economy for the years 2011 and 2019:

Year

2011
2019
Nominal GNP
"Sh.billion"

1,185.90
2,633.00
Real GNP
"Sh.billion"

1,185.90
1,474.00

Required:
(i) The implicit GNP price deflator for the years 2011 and 2019. Interpret your results.
(ii) The inflation rate of the economy, using year 2011 as the base year


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Question 3a
​​​​Summarise four effects of expansionary fiscal policy in an economy.


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August 2021

7 Questions
Question 1b
​​Explain the following terms in relation to labour as a factor of production:

(i) Participation rate.
(ii) Real wages.
(iii) Labour productivity.
(iv) Derived demand.


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Question 7b
​​The data below represents the national income of a certain economy in trillions of shillings:

Y = C + 1 + G + (X - M)
C = 100 + 0.6Yd
T = 10 + 0.2Y
I = 40
G = 50
(X - M) = 30

Where:
Y = National Income
c = Consumption expenditure
I = Investment
G = Government expenditure
Yd = Disposable income
T = Taxes
X = Exports
M = Imports

Required:
The equilibrium level of;

(i) National income.
(ii) Consumption.
(iii) Taxes.


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Question 5c
​​You have been provided with the following data for country Z:

Gross national product at current market prices $400 million
Price subsidies $10 million
Depreciation $24 million
Indirect taxes $60 million

Required:
Determine the value of each of the following
(i) Gross national product at factor cost.
(ii) Net national product at factor cost.


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Question 4c
​​Highlight five implications of a deflationary gap in an economy.


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Question 3b
​​With the aid of an illustration, describe the circular flow of income for a closed economy with the existence of the government.


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Question 2e
​​Using a suitable example, explain the term "transfer payments"


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Question 2d
​​With the help of a well labelled diagram, distinguish between "economic rent" and "quasi rent"


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May 2021

3 Questions
Question 4a
​​Examine six causes of a deflationary gap in an economy


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Question 6c
​​With the use of a diagram, illustrate the optimal point of a firm.


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Question 7b
​​(i) With a well labelled diagram, illustrate the concept of economic rent.
(ii) Explain how economic rent might be used as a good base for taxation


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November 2020

2 Questions
Question 2b
​​Citing four examples, explain the significance of mobility of factors of production. 


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Question 5b
​​(i) Explain the relationship between the multiplier and the accelerator. 
(ii) Evaluate four benefits that might accrue to an economy as a result of accelerator effect


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November 2019

8 Questions
Question 2b
​​Explain five factors that lead to the external economies of scale in an economy.


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Question 2c
​​Describe two assumptions of the law of variable proportions.


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Question 4a
The per capita income of a hypothetical country increased by 20% from the year 2015 to year 2018.Despite this increase in per capita income, the residents of the country felt that their living standards were deteriorating.

Required:
Discuss five reasons that might have led to this feeling by the residents.


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Question 3b
With the aid of a well labelled diagram, explain the concept of a backward bending supply curve of labour.


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Question 4b
​​Describe three methods that could be used to measure the national income of a country.


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Question 4c
​ ​​The following are the consumption and investment functions of country Y in Sh. "Billion".

C= 200 + 0.8Y
I = 400

Where:
C is Consumption
Y is Income
I is Investment

Required:
Calculate the aggregate spending at equilibrium level.


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Question 5b
​​Explain six factors that determine the level of induced investments in an economy. 


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Question 7a
​​Enumerate five causes of inequalities in the distribution of income and wealth in an economy.


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May 2019

5 Questions
Question 4c
​​Suggest policy measures that could be adopted by a government to enhance geographical mobility of labour within a country.


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Question 7c
​​The following information relates to the commodity and money markets of a certain closed economy in millions of shillings:

Commodity market
         C = 200 + 0.4y
          I = 1,900 - 12r

Money market
        MDT =0.5y
        MDS =100 - 10r
        MS = 1,500

Where:   C = Consumption function
               y = National income
               I = Investment function
               r = Rate of interest
               MDT = Speculative demand for money
               MDs = Money supply

Required:
(i) The IS function.
(ii) The LM function.
(iii) The equilibrium level of interest rate
(iv) The equilibrium level of national income.


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Question 7a
​​Argue cases against the use of national income statistics to compare the standards of living between countries.


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Question 5d
​​The following data relate to the consumption function of a hypothetical economy in millions of shillings:

C = 300 + 0.6y

Where:

C is the consumption function. y is the national income.

(i) The investment function.

(ii) Discuss factors that determine the level of consumption in an economy.


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Question 3b
​​Highlight factors that determine the effectiveness of trade unions in a society.


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November 2018

6 Questions
Question 3a
Summarise characteristics of capital as a factor of production.


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Question 7c
(i) The Gross National Product using the value added approach. 
(ii) Net Domestic Product at market price. 
(iii) Net Domestic Product at factor cost.


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Question 6b
Examine determinants of the level of national income of a country.


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Question 4c
​​ The marginal propensity to save of a certain hypothetical economy is given as 0.25
Required:
The change in the equilibrium level of national income, if the level of investments for the economy increases by Sh.300 million.


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Question 3c
Discuss cases advanced by trade unions for increase in the wages of their members.


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Question 1d
​​ Highlight barriers to occupational mobility of labour.


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May 2018

3 Questions
Question 6b
In a hypothetical economy X, autonomous consumption equals to 800 and the marginal propensity to save equals to 0.25
Required:
(i) Formulate the consumption function
(ii) If the level of investment increased by Sh.1.000 million, determine the change in equilibrium national income


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Question 3b
Suggest four reasons why wages in the agricultural sector tend to be lower than wages in the industrial sector.


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Question 5d

With the aid of a diagram, explain why isoquams are negatively sloped


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November 2017

5 Questions
Question 3a
Outline four factors that determine the supply of labour in an economy.


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Question 6b
Analyse six factors that influence the cost behaviour of a firm


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Question 6c
​​Using well labelled diagrams, distinguish between inflationary gap" and "deflationary gap" as used in national income statistics.


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Question 7c
The data provided below represent estimated national income figures for a hypothetical economy in millions of shillings

Gross National Product (at market price)
Depreciation allowance
Indirect taxes less subsidies
Business taxes
Personal income taxes
Government transfers
Retained profit
3,992
570
524
214
763
693
230

Required:
(i) Net National Product at market price.
(ii) Net National Product at factor cost.
(iii) Personal income.
(iv) Disposable income.


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Question 7d

Outline six challenges encountered by economic planners when using the income approach to estimate the level of national income in developing countries.


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May 2017

4 Questions
Question 2b
With reference to the theory of production, discuss five factors that could lead to:
(i) Increasing returns to scale.
(ii) Decreasing returns to scale.


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Question 3a
Explain the difference between "real" and "pecuniary" economies of scale of a firm.


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Question 3d
The following data relate to the nominal and real gross national product (GNP) levels of a certain economy for the years 2011 and 2016:
Year

2011
2016
Nominal GNP
(Sh. billion)

1,085
1,850
Real GNP
(Sh. billion)

1,085
1,275

Required:
(i) The gross national product implicit price deflator for the years 2011 and 2016. Interpret your results
(ii) Using year 2011 as the base year, determine the inflation rate for the economy.


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Question 5d
(i) Distinguish between the "multiplier" and the "accelerator" as used in national income statistics
(ii) Explain four factors that could limit the application of the multiplier in developing countries.


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November 2016

2 Questions
Question 2b
State six assumptions of the marginal productivity theory of wage determination.


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Question 4c
Discuss ten limitations of using national income statistics to compare the standards of living between different countries.


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May 2016

5 Questions
Question 7b
​​Highlight eight arguments in favour of international trade restrictions in a country.


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Question 6d
​Describe three ways in which a government could use fiscal policy to stimulate economic growth.


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Question 6a
​​Explain the term "balance of payments" as used in international trade.


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Question 5b
​ ​​The following data relate to the commodity and money markets of a hypothetical closed economy without government intervention, in millions of shillings:
  • C = 204 +0.7Y
  • 1 = 300 - 100r 
  • MDT = 0.25Y 
  • MDS = 248-200r 
  • Ms = 600 
Where:

  • C is the consumption function.
  • Y is the national income.
  • I is the investments function.
  • r is the rate of interest.
  • MDT is the precautionary and transactionary demand for money.
  • Mps is the speculative demand for money.
  • Ms is the money supply.

Required:

(i) Equilibrium level of interest rate.

(ii) Equilibrium level of national income.


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Question 5a
​​Explain five factors that determine the macroeconomic level of consumption in an economy.


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November 2015

3 Questions
Question 4c
​ ​​The following information relates to savings and investments of a certain economy in millions of shillings:
  • S =-500 + 0.36Y
  • I = 8.000
Where:
S = Savings function.
Y = National income.
I = Investments function.

Required:
(i) The consumption function.
(ii) The equilibrium level of national income.
(iii) The multiplier. Interpret your result.


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Question 7c
​ ​​The data provided below represent estimated national income figures for country "X" in trillion of shillings:

Gross National Product (at market price) 
620.4
Government transfers
78.6
Business taxes 
18.2
Personal income taxes
56.1
Depreciation allowance
42.3
Indirect taxes less subsides
36.5

Required: 
(i) Net National Income at factor cost. 

(ii) Net National Product at market price. 

(iii) Personal income. 

(iv) Disposable income for country "X".


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Question 4a
​ ​​ Outline five problems associated with the expenditure approach of measuring the national income of a country.


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Question 1b
​ ​​ The following data represents economic transactions of a hypothetical economy:

Sh. "million"
General government final expenditure
6,750
Taxes on expenditure
4,250
Transfer payments
675
Social security contributions
2,500
Net property income from abroad
250
Consumers expenditure
18,500
Subsidies
750
Gross domestic fixed capital formation
5,750
Corporate income tax
750
Undistributed profits
500
Personal income tax
1,000
Imports of goods and services
9,250
Exports of goods and services
8,750
Depreciation
3,500

Required: 
Calculate: 

(i) Gross national product. 

(ii) Net national product. 

(iii) National income. 

(iv) Personal income. 

(v) Disposable income.


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Question 1a
​​(i) Distinguish between "gross domestic product" and "gross national product".

(ii) Give the reasons for the lower value of the gross national product in the less developing countries.


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