JAIIB Paper 1 Module B Quiz 8

The law of diminishing marginal utility states that, other things equal, the additional satisfaction obtained from consuming successive units of a good tends to decline. It helps explain why consumers generally require a lower price to buy additional units. It does not mean total utility must immediately fall; total utility can still rise, but at a decreasing rate.

For an interior consumer optimum, marginal utility per rupee should be equal across goods, subject to the budget constraint. If MUx/Px is below MUy/Py, shifting some expenditure from X to Y can increase utility; the consumer should buy relatively less X and more Y until the ratios move toward equality. This is the equi-marginal principle.

When a price reduction increases total revenue, the percentage increase in quantity demanded exceeds the percentage decrease in price. This is the case of elastic demand, where the absolute value of price elasticity is greater than one. With inelastic demand, a price reduction normally reduces total revenue.

Increasing returns to scale occur when output rises by a greater percentage than the proportional increase in all inputs. Here inputs increase by 10% while output rises by 15%. This is distinct from diminishing marginal returns, which concerns adding one variable input while other inputs are held fixed in the short run.

Perfect competition is characterised by many buyers and sellers, a homogeneous product, relatively free entry and exit, and firms that are price takers. A single firm faces a market-determined price. Monopoly instead involves a single seller with significant market power, while oligopoly has a small number of interdependent firms.

M1, often called narrow money, includes currency with the public, demand deposits with the banking system, and other deposits with the RBI. Time deposits with banks are not included in M1; they are included in broader aggregates such as M3. The exact definitions should be learned as presented in RBI monetary statistics.

The percentage change in the price index is (168 − 160) / 160 × 100 = 5%. Inflation is a sustained increase in the general price level; a single index calculation measures the rate of change over the stated period. The calculation is not 8%, because the index-point change must be divided by the starting index.

Deflation is a sustained decline in the general price level. It differs from disinflation, which means inflation remains positive but slows, and from stagflation, which refers to weak or stagnant output combined with inflation. Falling prices during a downturn can also raise the real burden of fixed nominal debt.

The approximate Fisher relationship is nominal interest rate ≈ real interest rate + expected inflation. Rearranging gives an approximate real rate of 9% − 4% = 5%. The exact Fisher equation is (1 + nominal rate) = (1 + real rate)(1 + inflation), which gives a slightly different result; the question explicitly asks for the approximation.

The transactions motive refers to holding money to make regular payments for goods and services. Keynes also identified a precautionary motive for unexpected needs and a speculative motive linked to uncertainty about future bond prices and interest rates. These motives explain why people demand liquidity even when money itself may earn little or no interest.

An increase in the money supply raises real money balances at a given price level. In the standard IS–LM model this shifts LM right/down, lowering the equilibrium interest rate and increasing equilibrium output, assuming the IS curve and other conditions remain unchanged. The size of the response depends on the slopes of the curves and other model assumptions.

The contraction or recession phase follows a peak and involves declining economic activity, often accompanied by lower production, employment and income. A trough marks the low point before recovery begins. The exact statistical definition of recession may vary across institutions, but the described direction is a contraction.

An open-market purchase by the central bank pays for securities and adds reserves to the banking system. This tends to ease liquidity and can support credit expansion, subject to banks‘ willingness to lend, capital constraints, demand for credit and the central bank‘s operating framework. An open-market sale generally has the opposite reserve effect.

Increasing taxes reduces disposable income and can moderate private consumption and aggregate demand. It is a contractionary fiscal measure. The impact depends on the tax design and how households respond; it is different from monetary tightening, which operates through central-bank instruments and financial conditions.

In the simplest Keynesian model, the expenditure multiplier is 1/(1 − MPC). With MPC = 0.8, it is 1/0.2 = 5. This result assumes idle capacity and no leakages through taxes, imports or saving beyond the implied marginal propensity to save; in a more realistic economy the multiplier may be smaller.

Nominal GDP measures output at current prices, whereas real GDP adjusts for price changes. If nominal GDP grows 8% and real GDP grows 3%, the implied GDP-deflator inflation is approximately 5% using the common growth-rate approximation. The exact rate depends on the index-number relationship, but nominal growth exceeds real growth when prices contribute positively.

Gross national income (GNI) adds net primary income from the rest of the world to GDP. Interest earned by an Indian resident from a non-resident is a primary-income receipt and can raise India‘s GNI relative to GDP, subject to corresponding income payments to non-residents. GDP itself is based on production within the domestic economic territory.

In the simplest Keynesian income-expenditure model, an equal increase in government spending and lump-sum taxes raises equilibrium output by the same amount as the increase in spending. The balanced-budget multiplier is therefore 1. Government spending enters aggregate demand directly, while the tax increase reduces consumption only by the marginal propensity to consume, so the net effect is positive and equal to the initial change in spending. This result depends on the simplified model assumptions.

Receipts from disinvestment reduce the government‘s ownership stake and are normally classified as non-debt capital receipts. They are capital receipts because they arise from a transaction in financial assets, and non-debt because they do not create a repayment obligation like borrowing. They are distinct from tax revenue and revenue receipts.

Open Market Operations (OMOs), Cash Reserve Ratio (CRR), Statutory Liquidity Ratio (SLR), Repo Rate, and Reverse Repo Rate are quantitative instruments, whereas margin requirements and moral suasion are qualitative/selective instruments.