Question map
If the interest rate is decreased in an economy, it will
Explanation
The correct answer is option C because interest rate is the cost of investible funds, and at higher interest rates, firms tend to lower investment[1]. Conversely, when interest rates decrease, the cost of borrowing falls, making investment more attractive. All else equal, when the interest rate rises, the cost of investingâthe interest the business will payârises, resulting in less investment overall[2]. Therefore, a decrease in interest rates will have the opposite effect, increasing investment expenditure.
Option A is incorrect because growth in household consumption expenditure generally follows the same trend as growth in disposable income[3], and lower interest rates typically encourage rather than decrease consumption. Option B is incorrect as there is no direct automatic relationship between interest rate decreases and increased tax collection. Option D is incorrect because supply of savings results in lower interest rates, and a lower supply of savings results in higher interest rates[4], indicating that lower interest rates generally discourage rather than increase savings.
Sources- [1] Macroeconomics (NCERT class XII 2025 ed.) > Chapter 4: Determination of Income and Employment > 4.3.2 Effect of an Autonomous Change in Aggregate Demand on Income and Output > p. 60
- [2] https://www.congress.gov/crs-product/IF11020
- [4] https://www.congress.gov/crs-product/IF11020
PROVENANCE & STUDY PATTERN
Guest previewThis is a classic 'Sitter' derived directly from NCERT Macroeconomics. It tests the fundamental Investment Function (I = f(r)). While real-world economics is messy, UPSC Prelims demands the primary theoretical relationship: Interest Rate is the cost of capital; when it falls, Investment rises. Ignore secondary effects like tax buoyancy.
This question can be broken into the following sub-statements. Tap a statement sentence to jump into its detailed analysis.
- Statement 1: Does a decrease in interest rates in an economy decrease household consumption expenditure?
- Statement 2: Does a decrease in interest rates in an economy increase government tax collection (tax revenue)?
- Statement 3: Does a decrease in interest rates in an economy increase investment expenditure by firms?
- Statement 4: Does a decrease in interest rates in an economy increase total savings in the economy?
Explains that increased money supply and bank credit lead to higher disposable income and increased consumption (demandâpull inflation driver).
A student can infer that lower interest rates tend to raise bank credit/money supply, which would likely raise household consumption rather than decrease it.
Summarises that increases in money supply and bank credit increase disposable income and aggregate demand via higher private spending.
Combine this with the fact that lower interest rates usually boost credit and money creation to judge that consumption would rise, not fall.
Recommends lowering bank/repo rates as a policy to increase money supply and boost demand when fighting deflation.
Use the policy link (lower rates â more money supply â higher demand) to infer effects on household consumption.
Shows how changes in the marginal propensity to consume (mpc) change aggregate consumption for a given income level.
A student could combine the mpc mechanism with lower rates' effect on disposable income or borrowing to assess net consumption change.
Contains a past-question framing that links a fall in interest rates to possible changes in consumption, investment and savingsâhighlighting common textbook comparisons.
Use this as a checklist: compare whether lower rates more strongly affect borrowing/consumption or investment in the relevant economy to judge the statement.
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This statement analysis shows book citations, web sources and indirect clues. The first statement (S1) is open for preview.
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