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Excess and Deficient Demand for CUET Economics

About 5 min to learn · 53 questions

Full employment and involuntary unemployment, excess demand and the inflationary gap, deficient demand and the deflationary gap, their effects, and the fiscal and monetary measures that correct them, with graphs, worked examples and the traps CUET sets.

Syllabus area
Introductory Macroeconomics
On this page · 9 sections
  1. 01The core idea
  2. 02Full employment
  3. 03Excess demand and the inflationary gap
  4. 04Deficient demand and the deflationary gap
  5. 05Measures to correct the gaps
  6. 06Exam shortcuts
  7. 07Common mistakes
  8. 08Quick revision
  9. 09Check your understanding

The core idea

Equilibrium income is set by AD, but nothing guarantees it is the income that employs everyone willing to work. The yardstick is full-employment output: compare AD there with what the economy can produce.

Full employment

Full employment means everyone able and willing to work at the going wage has work. It still allows frictional unemployment (people between jobs) and voluntary unemployment (people who will not work at the going wage). Involuntary unemployment, people who want work at the going wage and cannot find it, is what demand policy targets.

Excess demand and the inflationary gap

Excess demand: AD is greater than output at full employment. The inflationary gap is the size of that excess, measured vertically at full-employment income.

A dashed 45° line, an AD line that meets it at F at the full-employment income of ₹400 crore, and a higher line AD₁. At ₹400 crore of income, AD₁ is ₹460 crore (point G), ₹60 crore above F.
The inflationary gap is GF = 460 − 400 = ₹60 crore.

Output cannot rise beyond full employment in the short run, so the extra demand pushes up prices: shortages, waiting lists and inflation, with no gain in real output.

Deficient demand and the deflationary gap

Deficient demand: AD is less than output at full employment. The deflationary gap is the shortfall at full-employment income.

A dashed 45° line, an AD line that meets it at F at the full-employment income of ₹400 crore, and a lower line AD₂. At ₹400 crore of income, AD₂ is ₹340 crore (point D), ₹60 crore below F. AD₂ meets the 45° line at E₂, at an income of ₹280 crore.
The deflationary gap is FD = ₹60 crore; with AD₂ the economy settles at E₂, ₹280 crore.

Unsold goods pile up, firms cut output and jobs, and the economy settles at an underemployment equilibrium, here ₹280 crore, with involuntary unemployment.

Watch out

The gap is measured in AD at full employment (₹60 crore here), not in income. The shortfall in income (400 − 280 = 120) is the gap times the multiplier, 2 here.

Example 1 · Sizing the gap

C = 40 + 0.75Y, planned investment ₹80 crore, full-employment income ₹400 crore.

  1. AD at full employment = 40 + 0.75 × 400 + 80 = 420.

  2. Inflationary gap = 420 − 400 = ₹20 crore.

  3. A ₹20 crore cut in government spending closes it.

Answer

Inflationary gap ₹20 crore

Measures to correct the gaps

Excess demandDeficient demand
Government spendingCut itRaise it (public works)
TaxesRaise themCut them
Repo and bank rateRaise themCut them
CRR and SLRRaise themCut them
Open market operationsSell securitiesBuy securities
Margin requirementsRaise themLower them

The first two are fiscal policy, decided by the government in its budget; the rest are monetary policy, run by the RBI.

Example 2 · Spending needed for full employment

Equilibrium income is ₹400 crore, full-employment income ₹500 crore, MPC 0.8.

  1. Income must rise by 100; the multiplier is 1 ÷ 0.2 = 5.

  2. Government spending must rise by 100 ÷ 5 = ₹20 crore.

Answer

₹20 crore

Exam shortcuts

  • Inflationary gap = AD at full employment − full-employment output.
  • Deflationary gap = full-employment output − AD at full employment.
  • Close a gap by shifting AD by the gap; income moves by gap × multiplier.
  • Excess demand → tight policy; deficient demand → easy policy.

Common mistakes

  • Measuring the gap in income instead of in AD.
  • Saying excess demand raises real output beyond full employment.
  • Raising taxes to cure deficient demand.
  • Counting frictional unemployment as involuntary.

Quick revision

Gaps

  • Excess demand: AD > full-employment output → inflation
  • Deficient demand: AD < full-employment output → unemployment
  • Gaps measured vertically at full employment

Remedies

  • Fiscal: G and taxes
  • Monetary: repo, bank rate, CRR, SLR, OMO, margins
  • Tight for excess, easy for deficient

The government's own spending and taxes are laid out in the government budget.

Next · 08Quick revision

Check your understanding

53 questions, grouped by type, easy to hard. Pick an answer and check it. The worked solution opens when you ask for it.

Full employment and involuntary unemploymentQ1 of 53Q1

Full employment and involuntary unemployment

8 questions

Full employment is a situation in which

Options for question 1

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AnswerB · everyone who is able and willing to work at the going wage has work

  1. Full employment means no involuntary unemployment.

  2. Some frictional unemployment (people between jobs) and voluntary unemployment can still exist.

Worth noting

'No unemployment of any kind' is too strong; full employment allows people who are changing jobs or do not want to work at the going wage.

Involuntary unemployment means

Options for question 2

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AnswerD · people willing to work at the going wage cannot find work

  1. Involuntary unemployment exists when there are more people willing to work than jobs at the current wage.

Disguised unemployment is most common in

Options for question 3

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AnswerD · small family farms

  1. Removing some workers from a small family farm would not reduce its output: their marginal product is zero.

Match each case with the kind of unemployment.

List IList II
A. A graduate refuses jobs below ₹50,000 a month though such jobs existI. Frictional
B. A factory worker looks for work at the going wage but finds none in a slumpII. Voluntary
C. A software engineer is between leaving one job and joining the nextIII. Disguised
D. A family of five does work that three could do on its small farmIV. Involuntary
Options for question 4

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AnswerA · A-II, B-IV, C-I, D-III

  1. Refusing available jobs is voluntary; failing to find work at the going wage is involuntary.

  2. Between jobs is frictional; extra hands adding nothing on a farm is disguised unemployment.

Assertion (A): Equilibrium income can be below the full-employment level.

Reason (R): Equilibrium depends on aggregate demand, which may be too low to employ everyone willing to work.

Options for question 5

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AnswerA · Both A and R are true, and R is the correct explanation of A.

  1. Keynes's key point: AD = AS can occur with involuntary unemployment. R explains A.

Read the two statements and choose the correct option.

I. At full employment, there are no frictional unemployed people.

II. At full employment, output cannot rise further in the short run.

Options for question 6

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AnswerB · Only II

  1. People changing jobs are always present. I is false.

  2. With all willing workers employed, output is at its short-run limit. II is true.

Which kind of unemployment does Keynesian policy to raise aggregate demand aim to remove?

Options for question 7

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AnswerD · Involuntary unemployment

  1. More demand creates jobs for people who want work at the going wage but cannot find it.

In Keynes's theory, an economy can be in equilibrium

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AnswerA · at full employment or below it

  1. Equilibrium needs AD = output, which can happen at any level of output up to full employment.

Excess demand and the inflationary gap

13 questions

Excess demand is a situation in which

Options for question 9

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AnswerC · aggregate demand is greater than aggregate supply at the full-employment level of output

  1. Spending planned is more than the economy can produce with full employment.

Worth noting

Demand exceeding supply for one good is a micro idea; excess demand here is for the whole economy.

The inflationary gap is

Options for question 10

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AnswerB · the amount by which aggregate demand exceeds aggregate supply at full employment

  1. It measures the excess demand at the full-employment level of output.

Which of these is NOT a measure to correct excess demand?

Options for question 11

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AnswerA · Raising government spending

  1. More government spending adds to AD and makes excess demand worse.

The graph shows AD₁ above AD at the full-employment income. The inflationary gap is

A dashed 45° line, an AD line that meets it at F at the full-employment income of ₹400 crore, and a higher line AD₁. At ₹400 crore of income, AD₁ is ₹460 crore (point G), ₹60 crore above F.
Options for question 12

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AnswerA · ₹60 crore

  1. At the full-employment income of 400, AD₁ = 460 (point G) while full-employment output is 400 (point F).

  2. Gap = 460 − 400 = ₹60 crore.

Worth noting

₹120 crore would be the multiplied effect on money income; the gap itself is the vertical distance at full employment.

The graph shows AD₁ above AD at full employment. Since output cannot rise beyond full employment in the short run, the excess demand mainly causes

A dashed 45° line, an AD line that meets it at F at the full-employment income of ₹400 crore, and a higher line AD₁. At ₹400 crore of income, AD₁ is ₹460 crore (point G), ₹60 crore above F.
Options for question 13

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AnswerC · a rise in the general price level

  1. With all resources already in use, extra spending bids up prices instead of output.

Match each effect with excess demand or deficient demand.

List IList II
A. Prices rise with no rise in outputI. Deficient demand: excess stock
B. Unsold stocks pile upII. Deficient demand: job losses
C. Firms' order books are full and stocks run downIII. Excess demand: inflation
D. Involuntary unemployment risesIV. Excess demand: shortages
Options for question 14

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AnswerA · A-III, B-I, C-IV, D-II

  1. Too much spending shows up as rising prices and running-down stocks.

  2. Too little spending shows up as piling stocks and lost jobs.

Assertion (A): Excess demand at full employment leads to inflation.

Reason (R): At full employment, output cannot rise to meet the extra demand.

Options for question 15

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AnswerA · Both A and R are true, and R is the correct explanation of A.

  1. Only prices can adjust when output is at its limit. R explains A.

Which of these could cause excess demand?

Options for question 16

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AnswerD · A big rise in government spending at full employment

  1. Extra spending at full employment pushes AD above full-employment output.

  2. The other three lower AD.

The graph shows AD₁ above AD at full employment. To close the gap with fiscal policy, aggregate demand must be brought down from

A dashed 45° line, an AD line that meets it at F at the full-employment income of ₹400 crore, and a higher line AD₁. At ₹400 crore of income, AD₁ is ₹460 crore (point G), ₹60 crore above F.
Options for question 17

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AnswerA · AD₁ to AD, by ₹60 crore, through spending cuts or higher taxes

  1. Cutting G or raising taxes by the size of the gap, ₹60 crore, shifts AD₁ down until it passes through F.

Read the two statements and choose the correct option.

I. Excess demand raises real output beyond the full-employment level.

II. Excess demand creates an inflationary gap.

Options for question 18

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AnswerB · Only II

  1. Output cannot go beyond full employment in the short run; prices rise instead. I is false.

  2. The excess of AD over full-employment output is the inflationary gap. II is true.

Full-employment output is ₹1,000 crore and aggregate demand at that output is ₹1,050 crore. There is

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AnswerC · an inflationary gap of ₹50 crore

  1. AD exceeds full-employment output by 1,050 − 1,000 = ₹50 crore: an inflationary gap.

Which of these is most likely to be seen when there is excess demand?

Options for question 20

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AnswerB · Shortages and rising prices

  1. Buyers want more than can be produced, so goods run short and prices are bid up.

C = 40 + 0.75Y, planned investment is ₹80 crore and full-employment income is ₹400 crore. The inflationary gap is

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AnswerA · ₹20 crore

  1. AD at an income of 400 = 40 + 0.75 × 400 + 80 = 420.

  2. Gap = AD − full-employment output = 420 − 400 = ₹20 crore.

Deficient demand and the deflationary gap

12 questions

Deficient demand is a situation in which

Options for question 22

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AnswerC · aggregate demand is less than aggregate supply at the full-employment level of output

  1. Planned spending is too low to buy all that full employment would produce.

The deflationary gap is

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AnswerA · the amount by which aggregate demand falls short of aggregate supply at full employment

  1. It measures the shortfall of demand at the full-employment level of output.

The graph shows AD₂ below AD at the full-employment income. The deflationary gap is

A dashed 45° line, an AD line that meets it at F at the full-employment income of ₹400 crore, and a lower line AD₂. At ₹400 crore of income, AD₂ is ₹340 crore (point D), ₹60 crore below F. AD₂ meets the 45° line at E₂, at an income of ₹280 crore.
Options for question 24

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AnswerA · ₹60 crore

  1. At the full-employment income of 400, AD₂ = 340 (point D) while full-employment output is 400 (point F).

  2. Gap = 400 − 340 = ₹60 crore.

Worth noting

₹120 crore is the shortfall of equilibrium income (400 − 280), not the gap in demand.

The graph shows AD₂ below AD. With AD₂, the economy settles at E₂. What does this mean?

A dashed 45° line, an AD line that meets it at F at the full-employment income of ₹400 crore, and a lower line AD₂. At ₹400 crore of income, AD₂ is ₹340 crore (point D), ₹60 crore below F. AD₂ meets the 45° line at E₂, at an income of ₹280 crore.
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AnswerB · Equilibrium income is ₹280 crore, with involuntary unemployment

  1. AD₂ meets the 45° line at E₂, at Y = 280, short of the full-employment income of 400.

  2. Output and jobs are below full employment: an underemployment equilibrium.

Which of these is an effect of deficient demand?

Options for question 26

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AnswerD · Output and employment fall

  1. Unsold goods pile up, so firms cut production and lay off workers.

Assertion (A): Deficient demand can cause long-lasting involuntary unemployment.

Reason (R): With demand too low, the economy can settle at an equilibrium below full employment, with no force pushing output up.

Options for question 27

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AnswerA · Both A and R are true, and R is the correct explanation of A.

  1. At that equilibrium, firms sell all they produce, so they have no reason to hire more. R explains A.

Read the two statements and choose the correct option.

I. A deflationary gap means that prices must be falling.

II. A deflationary gap means that output is above the full-employment level.

Options for question 28

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AnswerD · Neither I nor II

  1. The main effect is lower output and employment; prices may stay sticky. I is false.

  2. With too little demand, output settles below full employment, not above it. II is false.

Full-employment output is ₹1,000 crore and aggregate demand at that output is ₹900 crore. The deflationary gap is

Options for question 29

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AnswerB · ₹100 crore

  1. Gap = full-employment output − AD = 1,000 − 900 = ₹100 crore.

Which of these could cause deficient demand?

Options for question 30

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AnswerB · A sharp fall in private investment as firms become pessimistic

  1. Lower investment cuts AD directly and, through the multiplier, income.

  2. The other three raise AD.

Assertion (A): Deficient demand pushes prices up sharply.

Reason (R): Deficient demand means AD is less than output at full employment.

Options for question 31

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AnswerD · A is false, but R is true.

  1. R is the definition of deficient demand, so it is true.

  2. With too little demand, goods go unsold; prices do not rise sharply. A is false.

C = 40 + 0.75Y, planned investment is ₹40 crore and full-employment income is ₹400 crore. The deflationary gap is

Options for question 32

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AnswerA · ₹20 crore

  1. AD at an income of 400 = 40 + 0.75 × 400 + 40 = 380.

  2. Gap = 400 − 380 = ₹20 crore.

Worth noting

₹80 crore is how far equilibrium income (320) falls short of 400, which is the gap times the multiplier 4.

The graph shows AD₂ below AD. If AD₂ is raised by ₹60 crore at every income, equilibrium income rises by

A dashed 45° line, an AD line that meets it at F at the full-employment income of ₹400 crore, and a lower line AD₂. At ₹400 crore of income, AD₂ is ₹340 crore (point D), ₹60 crore below F. AD₂ meets the 45° line at E₂, at an income of ₹280 crore.
Options for question 33

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AnswerB · ₹120 crore

  1. Raising AD₂ by 60 makes it AD, which meets the 45° line at F (₹400 crore).

  2. Income rises from E₂ (280) to F (400), by ₹120 crore: the multiplier, 2 here, at work.

Fiscal measures

10 questions

Fiscal policy is the use of

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AnswerA · government spending and taxes

  1. Fiscal policy is set by the government through its budget.

To correct excess demand, the government should

Options for question 35

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AnswerD · cut its spending and raise taxes

  1. Less government spending lowers G directly; higher taxes lower disposable income and consumption.

  2. Both bring AD down towards full-employment output.

To correct deficient demand, the government should

Options for question 36

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AnswerB · raise its spending on public works and cut taxes

  1. More spending and lower taxes raise AD, which raises output and jobs through the multiplier.

Assertion (A): A rise in income tax helps to reduce deficient demand.

Reason (R): Higher taxes leave households with less disposable income to spend.

Options for question 37

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AnswerD · A is false, but R is true.

  1. R is true: taxes reduce disposable income and consumption.

  2. So a tax rise makes deficient demand worse, not better. A is false.

Read the two statements and choose the correct option.

I. Cutting taxes during a boom helps to control inflation.

II. Raising public spending on roads during a slump can raise income by more than the amount spent.

Options for question 38

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AnswerB · Only II

  1. Tax cuts raise spending, which adds to inflation in a boom. I is false.

  2. Government spending works through the multiplier. II is true.

The MPC is 0.75 and the government raises its spending by ₹30 crore. Income rises by

Options for question 39

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AnswerD · ₹120 crore

  1. Government spending is multiplied like investment: k = 1 ÷ 0.25 = 4.

  2. ΔY = 4 × 30 = ₹120 crore.

Read the two statements and choose the correct option.

I. A budget surplus is a suitable remedy for deficient demand.

II. Borrowing to spend more on public works is a remedy for deficient demand.

Options for question 40

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AnswerB · Only II

  1. A surplus takes more in taxes than it spends, which lowers AD. I is false.

  2. Deficit-financed spending adds to AD. II is true.

There is an inflationary gap of ₹20 crore. By how much should the government cut its spending to close it?

Options for question 41

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AnswerB · ₹20 crore

  1. The gap is measured in AD at full employment. A cut of ₹20 crore in G lowers AD by ₹20 crore at every income.

  2. That brings AD at full employment down to full-employment output, closing the gap.

Worth noting

₹80 crore is the change in income the cut brings about, not the cut itself.

Equilibrium income is ₹400 crore, full-employment income is ₹500 crore and the MPC is 0.8. By how much must government spending rise to reach full employment?

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AnswerA · ₹20 crore

  1. Income must rise by 500 − 400 = 100; the multiplier is 1 ÷ 0.2 = 5.

  2. Required ΔG = 100 ÷ 5 = ₹20 crore.

Worth noting

₹100 crore is the rise in income needed; the multiplier means spending need rise only a fifth of that.

There is a deflationary gap of ₹50 crore and the MPC is 0.8. To reach full employment, government spending should rise by

Options for question 43

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AnswerC · ₹50 crore

  1. The gap is the shortfall of AD at full employment, so AD must rise by ₹50 crore.

  2. A ₹50 crore rise in G does that; income then rises by 5 × 50 = 250 to full employment.

Worth noting

₹250 crore is the rise in income, not the rise in spending needed.

Monetary measures

10 questions

Raising the bank rate is a measure to correct

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AnswerC · excess demand

  1. A higher bank rate makes borrowing costlier and reduces spending.

Read the two statements and choose the correct option.

I. Fiscal policy is decided by the Reserve Bank of India.

II. Monetary policy is decided by the Reserve Bank of India.

Options for question 45

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AnswerB · Only II

  1. Fiscal policy is the government's budget. I is false.

  2. The RBI, through its Monetary Policy Committee, runs monetary policy. II is true.

Which monetary measure helps to correct excess demand?

Options for question 46

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AnswerC · Raising the repo rate

  1. A higher repo rate makes credit costlier, so borrowing and spending fall.

  2. The other three make credit cheaper or more plentiful.

Which monetary measure helps to correct deficient demand?

Options for question 47

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AnswerC · Buying government securities in the open market

  1. Purchases add to banks' reserves, so they can lend more and spending rises.

Assertion (A): Selling government securities in the open market helps to control excess demand.

Reason (R): Selling securities adds to banks' reserves and their ability to lend.

Options for question 48

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AnswerC · A is true, but R is false.

  1. A is true: sales take money out of the banking system.

  2. R is false: buyers pay the RBI, so banks' reserves and lending fall, not rise.

Read the two statements and choose the correct option.

I. Lowering margin requirements helps to fight deficient demand.

II. Raising the SLR helps to fight deficient demand.

Options for question 49

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AnswerA · Only I

  1. Lower margins let borrowers get larger loans, raising spending. I is true.

  2. A higher SLR locks up more bank funds and cuts lending. II is false.

During a period of deficient demand, which combination of policies is most suitable?

Options for question 50

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AnswerD · Higher government spending, lower taxes and a lower repo rate

  1. All three raise AD: more public spending, more disposable income and cheaper credit.

During deficient demand, a cut in the CRR works mainly by

Options for question 51

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AnswerD · freeing funds for banks to lend

  1. Banks keep less with the RBI, so they can lend more, and more credit supports spending.

Assertion (A): In a slump, the RBI buys government securities.

Reason (R): Purchases add reserves to banks, which can then lend more.

Options for question 52

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AnswerA · Both A and R are true, and R is the correct explanation of A.

  1. More lending raises spending and helps close a deflationary gap. R explains A.

Match each measure with the problem it is used to correct.

List IList II
A. Raising the CRRI. Deficient demand (monetary)
B. Cutting taxesII. Excess demand (open market)
C. Selling government securitiesIII. Deficient demand (fiscal)
D. Cutting the repo rateIV. Excess demand (monetary)
Options for question 53

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AnswerB · A-IV, B-III, C-II, D-I

  1. A higher CRR and sales of securities shrink credit; tax cuts and repo cuts expand spending.

NTA's Economics syllabus is three courses: Introductory Microeconomics, Introductory Macroeconomics and Indian Economic Development, each split into units with a list of topics. It prints no chapters and no split of the 50 questions across the courses. So the areas here are NTA's three courses, and the chapters inside them are ours: a unit that covers several ideas, such as consumer behaviour and demand, is split into a chapter for each, so that a chapter can be practised in one sitting. All three courses are here.