15 extra multiple-choice questions for Consumption and Investment Functions (12th Standard Economics, Samacheer Kalvi), beyond the ones printed in the textbook — each with the correct option highlighted and a clear, worked explanation. Free to read in English and Tamil.
Q1
Who first systematically developed the simple accelerator model in the year 1917?
- A. J.M. ClarkCorrect
- B. J.M. Keynes
- C. R.F. Kahn
- D. J.R. Hicks
Explanation. J.M. Clark systematically developed the simple accelerator model in 1917, while other economists like Hicks and Samuelson developed it further in relation to business cycles.
Q2
In the linear consumption function equation C = a + bY, what does the intercept term 'a' represent?
- A. Marginal propensity to consume
- B. Autonomous consumptionCorrect
- C. Induced saving
- D. Average propensity to save
Explanation. The intercept 'a' represents autonomous consumption, which refers to the minimum level of spending that occurs even when disposable income is zero.
Q3
Which of the following is categorized as a subjective factor influencing the consumption function according to Keynes?
- A. Windfall gains
- B. The motive of calculationCorrect
- C. Consumer credit
- D. Price level
Explanation. The motive of calculation is an internal psychological or subjective factor, whereas windfall gains, consumer credit, and price level are external objective factors.
Q4
Who is credited with first developing the concept of the multiplier in terms of employment?
- A. J.M. Keynes
- B. R.F. KahnCorrect
- C. J.R. Hicks
- D. J.M. Clark
Explanation. R.F. Kahn originally developed the concept of the multiplier in terms of employment, which J.M. Keynes later redefined as the investment multiplier.
Q5
If the marginal propensity to consume (MPC) is 0.8, what will be the value of the investment multiplier (K)?
- A. 2
- B. 4
- C. 5Correct
- D. 10
Explanation. The investment multiplier is calculated as the reciprocal of one minus the MPC. With an MPC of 0.8, the multiplier is calculated as one divided by 0.2, which equals five.
Q6
What type of investment is independent of changes in national income and is primarily driven by social welfare considerations?
- A. Induced investment
- B. Private investment
- C. Autonomous investmentCorrect
- D. Financial investment
Explanation. Autonomous investment is capital expenditure that is independent of changes in income or interest rates, typically undertaken by the government for social welfare.
Q7
In the investment function, what is the typical relationship between the rate of interest and the level of investment?
- A. Direct and positive
- B. Functional and inverseCorrect
- C. Constant and linear
- D. Unrelated and random
Explanation. The rate of interest and investment share an inverse relationship because higher interest rates raise the cost of borrowing, making fewer investment projects profitable.
Q8
Which concept specifically measures the rate of return on just those units of capital over and above the existing capital stock?
- A. Marginal Efficiency of Capital (MEC)
- B. Marginal Propensity to Save (MPS)
- C. Marginal Efficiency of Investment (MEI)Correct
- D. Accelerator coefficient
Explanation. The Marginal Efficiency of Investment is a flow concept that represents the rate of return on additions to the capital stock beyond the existing capital stock.
Q9
According to Duesenberry's hypothesis, the tendency of lower-income families to mimic the consumption patterns of higher-income families is known as the:
- A. Veblen effect
- B. Demonstration effectCorrect
- C. Leverage effect
- D. Multiplier effect
Explanation. The demonstration effect explains how individuals imitate the consumption standards of higher-income groups, which often leads to spending beyond their current income level.
Q10
Which economist mathematically combined the multiplier and accelerator principles to formulate the concept of the 'Super Multiplier'?
- A. J.R. HicksCorrect
- B. J.M. Keynes
- C. Paul Samuelson
- D. R.F. Kahn
Explanation. J.R. Hicks combined the simple investment multiplier and the accelerator principle mathematically to analyze the total effect of initial investment on national income.
Q11
When a portion of additional income is utilized to pay off past debts, how does this affect the multiplier's operation?
- A. It increases the multiplier's value.
- B. It reduces the multiplier's value.Correct
- C. It has no impact on the multiplier.
- D. It makes the multiplier infinite.
Explanation. Repayment of past debts represents a leakage from the circular flow of income, reducing the marginal propensity to consume and lowering the multiplier effect.
Q12
Which of the following equations accurately reflects the relationship between the marginal propensity to consume (MPC) and the marginal propensity to save (MPS)?
- A. MPC - MPS = 1
- B. MPC + MPS = 1Correct
- C. MPC / MPS = 1
- D. MPC * MPS = 1
Explanation. Because any additional unit of national income must be either consumed or saved, the sum of the MPC and the MPS must always equal one.
Q13
Under which condition does Keynes's Psychological Law of Consumption hold good?
- A. During periods of hyperinflation
- B. Under active government regulation of enterprise
- C. Under normal, peaceful economic conditionsCorrect
- D. In a completely planned socialist economy
Explanation. The law assumes normal, peaceful conditions because abnormal circumstances like wars, revolutions, or hyperinflation disrupt standard consumer behavior.
Q14
Which of the following is classified as a long-run factor that influences the Marginal Efficiency of Capital (MEC)?
- A. Current rate of investment in a particular industry
- B. Rate of growth of the populationCorrect
- C. Short-term consumer demand changes
- D. Liquid assets held by entrepreneurs
Explanation. Population growth is a long-run factor that increases long-term demand for goods and services, thereby raising the expected profitability of capital.
Q15
What is the term used to describe the combined, compounding effect of both the multiplier and the accelerator on income propagation?
- A. Demonstration effect
- B. Leverage effectCorrect
- C. Pigou effect
- D. Substitution effect
Explanation. The leverage effect is the total magnifying impact on national income caused by the mutual interaction of the multiplier and the accelerator.
