CBSE Class 12 Economics Determination of Income and Employment Assignment Set 04

Question. What is the relationship between investment and national income?
Answer: There is a direct and multiple-fold relationship between investment and national income, where an initial change in investment leads to a much larger final change in national income, driven by the multiplier effect.
In simple words: Investing money in the economy leads to a much larger increase in total national income.
Exam Tip: Use the term "investment multiplier" (\( K = \Delta Y / \Delta I \)) to describe this direct relationship.

Question. How does an increase in investment affect level of income?
Answer: An increase in investment boosts national income by a multiple factor. This happens because one person's investment spending becomes another person's income, leading to successive rounds of consumption spending based on the marginal propensity to consume.
In simple words: When businesses invest, they pay workers and suppliers, who then spend that money elsewhere, causing national income to grow in multiple rounds.

Exam Tip: Describe the multi-stage circular flow of income initiated by the new investment.

Question. What does investment multiplier indicate?
Answer: The investment multiplier (\( K \)) indicates the ratio of the final change in national income (\( \Delta Y \)) resulting from an initial change in investment (\( \Delta I \)).
In simple words: The multiplier shows how many times national income will increase for every rupee of new investment.

Exam Tip: Express this using the formula \( K = \frac{\Delta Y}{\Delta I} \).

Question. How does multiplier works?
Answer: The multiplier works through successive rounds of consumption. When fresh investment is made, it increases the income of those who receive it; they then spend a portion of this new income (determined by MPC) on goods, which becomes income for someone else, repeating the cycle.
In simple words: An initial investment creates new income, which gets spent and re-spent across the economy, multiplying the final impact.

Exam Tip: Outline a simple numerical table showing rounds of income generation, consumption, and saving to explain its working clearly.

Question. What can be minimum value of multiplier and why?
Answer: The minimum value of the multiplier is one. This happens when the marginal propensity to consume (MPC) is zero, meaning the entire increase in income is saved and none is spent on further consumption.
In simple words: The lowest the multiplier can go is 1, which happens when people save all of their extra income and spend none of it.

Exam Tip: Show mathematically: if \( MPC = 0 \), then \( K = \frac{1}{1 - 0} = 1 \).

Question. What is the relationship of K with MPC and MPS?
Answer: The multiplier (\( K \)) has a direct relationship with the marginal propensity to consume (MPC) and an inverse relationship with the marginal propensity to save (MPS).
In simple words: The more people spend of their extra income (higher MPC), the higher the multiplier; the more they save (higher MPS), the lower the multiplier.

Exam Tip: State the two key formulas: \( K = \frac{1}{1 - MPC} \) and \( K = \frac{1}{MPS} \).

Question. What will be the effect on K if MPC increases?
Answer: If the Marginal Propensity to Consume (MPC) increases, the value of the multiplier (\( K \)) will also increase because a larger portion of income is re-spent in each round.
In simple words: When people spend more of their extra income, the multiplier gets bigger.

Exam Tip: Explain that because \( K = \frac{1}{1 - MPC} \), any increase in MPC reduces the denominator, thereby raising the value of \( K \).

Question. What will be the effect on K if MPC decreases?
Answer: When the Marginal Propensity to Consume (MPC) decreases, the value of the multiplier (\( K \)) falls because less money is spent on consumption in subsequent rounds.
In simple words: If people spend less of their new income, the multiplier becomes smaller.

Exam Tip: State that a lower MPC increases the leakages from the circular flow of income, reducing \( K \).

Question. What will be the effect on K if MPS increases?
Answer: If the Marginal Propensity to Save (MPS) increases, the multiplier (\( K \)) will decrease because a higher rate of saving acts as a leakage from the circular flow of income.
In simple words: When saving rates go up, the multiplier goes down because less money is passed along.

Exam Tip: Since \( K = \frac{1}{MPS} \), an increase in MPS directly lowers the final value of \( K \).

Question. What will be the effect on K if MPS decreases?
Answer: A decrease in the Marginal Propensity to Save (MPS) leads to an increase in the value of the multiplier (\( K \)) as less money is taken out of circulation as savings.
In simple words: If people save less of their extra income, the multiplier gets larger.

Exam Tip: Mention that a lower MPS means higher MPC, which amplifies the rounds of income generation.

Question. If value of MPS is 0.25, what is the value of multiplier?
Answer: Given that \( MPS = 0.25 \), we can find the multiplier using the formula:
\( K = \frac{1}{MPS} \)
\( \implies K = \frac{1}{0.25} = 4 \)
Thus, the value of the multiplier is 4.
In simple words: If the savings rate is 0.25, the multiplier is 4, meaning income will grow by four times the investment.

Exam Tip: Always show the formula used and the basic step-by-step division to secure full marks.

Question. If value of MPC is 0.8, find out value of multiplier(K).
Answer: Using the formula for the investment multiplier:
\( K = \frac{1}{1 - MPC} \)
\( \implies K = \frac{1}{1 - 0.8} = \frac{1}{0.2} = 5 \)
Therefore, the value of the multiplier \( K \) is 5.
In simple words: When the spending rate is 0.8, the multiplier is 5.

Exam Tip: Double check your arithmetic; \( 1 - 0.8 = 0.2 \), and \( 1 / 0.2 \) equals \( 5 \).

Question. Calculate: Change in Income when MPC=0.8 and change in investment = Rs. 1,000.
Answer: First, calculate the investment multiplier \( K \):
\( K = \frac{1}{1 - MPC} = \frac{1}{1 - 0.8} = \frac{1}{0.2} = 5 \)
Now, find the change in income (\( \Delta Y \)) using the formula:
\( K = \frac{\Delta Y}{\Delta I} \)
\( \implies \Delta Y = K \times \Delta I = 5 \times \text{Rs. } 1,000 = \text{Rs. } 5,000 \)
Therefore, the change in income is Rs. 5,000.
In simple words: With a multiplier of 5, an investment of Rs. 1,000 will increase the national income by Rs. 5,000.

Exam Tip: Calculate the value of \( K \) first, then use it to find the final change in income.

Question. In an economy MPC is 0.75. If investment expenditure is increased by Rs 100 crore, calculate total increase in income and consumption expenditure.
Answer: First, find the multiplier \( K \):
\( K = \frac{1}{1 - MPC} = \frac{1}{1 - 0.75} = \frac{1}{0.25} = 4 \)
The total increase in income (\( \Delta Y \)) is:
\( \Delta Y = K \times \Delta I = 4 \times \text{Rs. } 100 \text{ crore} = \text{Rs. } 400 \text{ crore} \)
The total increase in consumption expenditure (\( \Delta C \)) is:
\( \Delta C = MPC \times \Delta Y = 0.75 \times \text{Rs. } 400 \text{ crore} = \text{Rs. } 300 \text{ crore} \)
Therefore, the total increase in income is Rs. 400 crore and consumption expenditure is Rs. 300 crore.
In simple words: The national income will rise by Rs. 400 crore, and out of that, people will spend Rs. 300 crore on consumption.

Exam Tip: Clearly separate the calculations for change in income (\( \Delta Y \)) and change in consumption (\( \Delta C \)).

Content: Problem of excess and deficient demand

Question. Why must aggregate demand be equal to aggregate supply at equilibrium level of income and output. Explain with the help of a diagram.
Answer: Aggregate demand must equal aggregate supply at equilibrium because if they are unequal, it creates forces that adjust production. If \( AD > AS \), inventories fall and firms expand output; if \( AD < AS \), unsold goods accumulate and firms scale back production. Equilibrium is reached only when planned spending matches planned output.

In simple words: The economy only settles when what buyers want to spend exactly matches what factories want to sell.
Exam Tip: Point E represents equilibrium; always mention how market forces correct any deviation from this point.

Question. What happens to the level of national income when AD falls short of AS?
Answer: When aggregate demand is less than aggregate supply, it leads to an accumulation of unsold inventory. Consequently, producers cut down their production, which leads to a reduction in the level of national income until AD and AS balance.
In simple words: When spending is too low, unsold items build up, forcing companies to produce less, which reduces national income.

Exam Tip: Explain this as a corrective process where falling output brings the economy back to equilibrium.

Question. When is there full employment equilibrium?
Answer: Full employment equilibrium is established when the level of aggregate demand is exactly equal to aggregate supply at a point where all those willing and able to work are fully employed.
In simple words: This is when the economy is in balance and every person who wants a job has one.

Exam Tip: Emphasize that this occurs when the equilibrium output matches the potential output of the economy.

Question. Will there always be full employment at equilibrium level of income?
Answer: No, the equilibrium level of income does not guarantee full employment. An economy can be in equilibrium at under-employment (where resources are underutilized) or over-full employment levels.
In simple words: No, an economy can find a stable balance even while many people remain unemployed.

Exam Tip: Cite Keynesian theory, which states that equilibrium can occur at full employment, under-employment, or over-full employment.

Question. Why should planned saving and planned investment be equal at equilibrium level of income? Use diagram.
Answer: Planned saving and investment must be equal because they are components of aggregate demand and supply. Since \( Y = C + S \) and \( AD = C + I \), at equilibrium \( Y = AD \), which mathematically means \( C + S = C + I \), or \( S = I \). Any inequality causes income to adjust until they are equal.

In simple words: Savings represent money taken out of spending, while investment is money put back in. They must balance for the economy to remain steady.
Exam Tip: Point out that the savings curve has a negative intercept (representing autonomous dissavings) while investment is drawn as a horizontal line (representing autonomous investment).

Question. Can there be unemployment at equilibrium level of income?
Answer: Yes, there can be unemployment at the equilibrium level of income. This is known as underemployment equilibrium, where aggregate demand is insufficient to employ all willing workers.
In simple words: Yes, the economy can be in balance even if some people cannot find jobs.

Exam Tip: Specify that this is called "under-employment equilibrium" and is caused by deficient aggregate demand.

Question. Can deflationary gap exist at equilibrium level of income?
Answer: Yes, a deflationary gap exists when the equilibrium level of aggregate demand is less than the aggregate demand required to maintain full employment.
In simple words: Yes, a deflationary gap happens when spending is too low to create jobs for everyone, even if the economy is stable.

Exam Tip: Define deflationary gap as the shortfall in aggregate demand below the full employment level.

Question. Explain that equilibrium level of income is not necessarily at full employment level?
Answer: The equilibrium level of income depends solely on the equality of planned aggregate demand and aggregate supply. If aggregate demand is low, the economy settles at an underemployment equilibrium; if demand is excessive, it settles at an over-full employment equilibrium, showing that full employment is just one of many possible states.
In simple words: The economy balances wherever demand meets supply, which might happen long before everyone is employed.

Exam Tip: Contrast underemployment equilibrium with full employment equilibrium to illustrate this concept.

Question. Explain the concept of under employment equilibrium with the help of a diagram. Show on the same diagram the additional investment expenditure required to reach full employment equilibrium.
Answer: Underemployment equilibrium occurs when aggregate demand (\( AD_{U} \)) is equal to aggregate supply (\( AS \)) at a level of output below the full employment level (\( Y_{F} \)). To bridge this gap and reach full employment, additional investment expenditure (equal to the deflationary gap) is required, which shifts the aggregate demand curve upward to \( AD_{F} \).

In simple words: This is a state where the economy balances out before reaching full employment. Adding more investment spending boosts demand and helps achieve full employment.
Exam Tip: Highlight that the vertical distance between the two AD curves measures the deflationary gap and indicates the injection of investment needed.

Question. What happens in the economy if there is excess of aggregate demand over the available output at full employment?
Answer: When aggregate demand exceeds the available output at full employment, it creates an inflationary gap. Since real output cannot increase past full employment, this excess demand causes prices to rise, leading to inflation.
In simple words: If people try to buy more than what the economy can physically produce, it will cause prices to shoot up.

Exam Tip: Clarify that in this situation, real output remains constant while nominal income and prices increase.

Content: Measures to correct Excess and Deficient Demand - availability of credit, change in Government spending

Question. What is meant by excess demand?
Answer: Excess demand refers to a situation where aggregate demand is greater than aggregate supply at the level of full employment in an economy.
In simple words: Excess demand is when the total desire to buy goods is greater than the economy's maximum capacity to produce them.

Exam Tip: Always link the definition of excess demand to the "full employment level" of aggregate supply.

Question. How does the introduction of government sector affect the economy?
Answer: The introduction of the government sector introduces government expenditure (\( G \)) as a component of aggregate demand and taxes (\( T \)) as a leakage, thereby affecting the equilibrium level of income and output.
In simple words: The government affects the economy by spending money on public projects and collecting taxes from citizens.

Exam Tip: Note that the aggregate demand formula changes from \( AD = C + I \) to \( AD = C + I + G \) when the government is introduced.

Question. What is meant by Fiscal Policy?
Answer: Fiscal policy is the strategy used by a government involving its taxation and public expenditure policies to influence the level of economic activity and stabilize the economy.
In simple words: Fiscal policy is how the government uses taxes and spending to keep the economy stable.

Exam Tip: Differentiate fiscal policy (government-led) from monetary policy (central bank-led).

Question. How do (a) changes in Govt. expenditure (b) Change in tax rate affect demand in the economy?
Answer:
(a) An increase in government expenditure directly increases aggregate demand by injecting money into the economy, while a decrease reduces it.
(b) An increase in tax rates reduces disposable income, thereby lowering consumption and aggregate demand, while a decrease in tax rates stimulates demand.
In simple words:
(a) When the government spends more on things like roads, it boosts demand.
(b) High taxes leave people with less spending money, which lowers demand.

Exam Tip: Address parts (a) and (b) clearly and separately to match the structure of the question.

Question. Would you advocate expansion or contraction of credit supply in a situation of excess demand?/deficient demand?
Answer: In a situation of excess demand, a contraction of credit supply should be advocated to reduce borrowing and spending. In a situation of deficient demand, an expansion of credit supply is recommended to encourage borrowing and boost aggregate spending.
In simple words: If demand is too high, make credit harder to get; if demand is too low, make borrowing cheaper and easier.

Exam Tip: Use terms like "dear money policy" for contraction and "cheap money policy" for expansion.

Question. What happens to the economy when credit availability is restricted and credit made costlier?
Answer: Restricting credit and making it costlier reduces borrowing by consumers and investors, leading to a decrease in aggregate demand, which helps control inflation and excess demand.
In simple words: Making loans expensive discourages people and businesses from borrowing, which slows down spending and cools off inflation.

Exam Tip: Explain how higher interest rates reduce the disposable income available for investment and consumption.

Question. What is bank rate?
Answer: Bank rate is the interest rate at which the central bank lends money to commercial banks to meet their long-term financial requirements.
In simple words: Bank rate is the interest rate that the main central bank charges other banks for long-term loans.

Exam Tip: Specify that bank rate is used for "long-term" lending, which distinguishes it from the Repo rate.

Question. What is the role of bank rate in reducing excess demand?
Answer: To reduce excess demand, the central bank increases the bank rate, which makes borrowing more expensive for commercial banks. These banks then raise their lending rates, discouraging public borrowing and reducing aggregate demand.
In simple words: Raising the bank rate makes loans expensive for everyone, which cuts down on spending and reduces high demand.

Exam Tip: Detail the transmission mechanism: Bank Rate increases
\( \implies \) Lending rates increase
\( \implies \) Borrowing decreases
\( \implies \) AD decreases.

Question. What is meant by open market operation?
Answer: Open market operations refer to the buying and selling of government securities by the central bank in the open market to regulate the money supply.
In simple words: It is when the central bank buys or sells government bonds to control how much money is flowing in the economy.

Exam Tip: Mention that these operations directly affect the cash reserves of commercial banks.

Question. How do open market operations affect availability of credit?
Answer: Selling government securities absorbs cash reserves from commercial banks, reducing their credit-creating capacity. Conversely, buying securities injects cash into banks, expanding their capacity to lend.
In simple words: Selling bonds takes cash out of banks, so they can lend less; buying bonds puts cash into banks, allowing them to lend more.

Exam Tip: Connect bank reserves directly to credit creation capability.

Question. What is meant by CRR?
Answer: Cash Reserve Ratio (CRR) is the specified minimum percentage of total net demand and time liabilities that commercial banks are legally required to keep as reserves with the central bank.
In simple words: CRR is the portion of deposits that banks must keep safely with the central bank, meaning they cannot lend it out.

Exam Tip: Emphasize that CRR is kept "with the central bank" and is calculated as a percentage of "deposits."

Question. How do change in cash reserve ratio (CRR) affects availability of credit?
Answer: An increase in CRR forces commercial banks to keep more cash with the central bank, leaving them with fewer funds to lend. A decrease in CRR frees up bank funds, thereby expanding credit availability.
In simple words: Raising CRR locks up more money in reserves, leaving less cash for loans. Lowering it lets banks lend out more.

Exam Tip: Clearly state the inverse relationship between CRR and credit-creating capacity.

Question. What is meant by deficient demand?
Answer: Deficient demand is a situation where planned aggregate demand is less than the aggregate supply required to maintain full employment in the economy.
In simple words: Deficient demand means there is not enough spending in the economy to create jobs for everyone who wants to work.

Exam Tip: Note that deficient demand leads to a deflationary gap and involuntary unemployment.

Question. What happens to the level of income when there is deficient demand?
Answer: When there is deficient demand, unsold goods accumulate, leading producers to scale down output, which reduces the equilibrium level of national income and employment.
In simple words: Low demand means things do not sell, causing businesses to make less and cutting down national income.

Exam Tip: Mention that deficient demand causes the economy to settle at an underemployment equilibrium level.

Question. What are the Quantitative measures of Monetary Policy?
Answer: Quantitative measures of monetary policy include Bank Rate, Repo Rate, Reverse Repo Rate, Open Market Operations, and Cash Reserve Ratio (CRR).
In simple words: These are tools used by the central bank to control the total volume of money and credit in the entire country.

Exam Tip: These measures are distinct from qualitative tools because they regulate the overall volume of credit, not its direction.

Question. How the Govt.’s expenditure policy and Revenue policy help in rectifying the situation of deficient demand?
Answer: To correct deficient demand, the government increases public expenditure to inject money directly into the economy. Simultaneously, it reduces tax rates (revenue policy) to increase the disposable income of households, which boosts consumption and aggregate demand.
In simple words: To fix low demand, the government spends more on projects and lowers taxes so people have more cash to spend.

Exam Tip: Explain both sides: increasing \(G \) (spending) and reducing \( T \) (taxes).