"Business Economics" — Practice

Question 1

Business economics (managerial economics) is best described as:
(a) A pure branch of theoretical macroeconomics with no application to firm-level decisions  (b) A purely descriptive study of a firm's accounting records  (c) The application of economic theory and analytical tools to solve practical problems of business decision-making  (d) A branch of law governing business contracts and agreements

Accepted Answer

Business economics is distinguished from pure economic theory precisely by its applied, decision-oriented focus — it uses the tools of demand, cost, and market-structure analysis to solve real pricing, output, and resource-allocation problems a firm actually faces, rather than remaining a purely theoretical or descriptive exercise.

Answer: (c). Trap (a) wrongly restricts it to macroeconomic theory with no practical application, the opposite of its defining feature. Trap (b) confuses it with financial accounting, a different discipline entirely. Trap (d) misclassifies it as a legal subject rather than an economic-analytical one.

Question 2

Which of the following is classified as an exception to the law of demand, where quantity demanded may rise even as the good's own price rises?
(a) A good with many close substitutes available in the market  (b) A luxury good with high income elasticity of demand  (c) A good sold under conditions of perfect competition  (d) A Giffen good, where a price rise for a strongly inferior, budget-dominant good can increase quantity demanded via a dominant income effect

Accepted Answer

A Giffen good is a strongly inferior good that dominates a poor household's budget; when its price rises, the resulting fall in real income forces the household to cut back on relatively costlier alternatives and buy more of the now-pricier staple itself, producing an upward-sloping demand relationship that is the classic exception to the law of demand.

Answer: (d). Trap (a) describes an ordinary good whose demand still obeys the law of demand; substitute availability affects elasticity, not the direction of the price-quantity relationship. Trap (b) and (c) both describe unrelated demand or market characteristics that do not, by themselves, produce an exception to the law of demand.

Question 3

The price of a good rises from ₹100 to ₹120, and quantity demanded falls from 500 units to 450 units. What is the price elasticity of demand (in absolute value), and how should demand be classified?
(a) 0.5, inelastic  (b) 1.5, elastic  (c) 1, unitary elastic  (d) 2, highly elastic

Accepted Answer

%Δ Price = (120 − 100) ÷ 100 = 20 ÷ 100 = +20%. %Δ Quantity Demanded = (450 − 500) ÷ 500 = −50 ÷ 500 = −10%. E_d = −10% ÷ 20% = −0.5, so |E_d| = 0.5, which is less than 1, meaning demand is inelastic.

Answer: (a) 0.5, inelastic. Trap (b), (c), and (d) all result from an incorrect base used in computing one of the two percentage changes, producing an elasticity value above the correctly computed 0.5.

Question 4

The law of supply states that, other factors remaining constant:
(a) Quantity supplied falls as price rises  (b) Quantity supplied rises as price rises, reflecting a direct price-quantity relationship  (c) Quantity supplied is entirely unaffected by changes in price  (d) Quantity supplied depends only on government regulation, not on price

Accepted Answer

The law of supply describes a direct relationship between price and quantity supplied — as price rises, production becomes more profitable at the margin, inducing producers to supply more, producing the familiar upward-sloping supply curve.

Answer: (b). Trap (a) describes an inverse relationship, the opposite of the law of supply. Trap (c) and (d) both wrongly claim price has no influence on quantity supplied, contradicting the law's basic premise.

Question 5

Under the law of variable proportions, the stage at which marginal product is positive but declining, and at which a rational producer chooses to operate, is:
(a) Stage I, where marginal product is still rising  (b) Stage III, where marginal product has turned negative  (c) Stage II, where marginal product is positive but declining, and average product is at or past its maximum  (d) None of the three stages, since a rational producer avoids operating in any of them

Accepted Answer

Stage II is the rational operating zone: marginal product is still positive (so additional input still adds to output) but declining, and average product is at or past its peak — Stage I is abandoned because further expansion remains profitable, and Stage III is avoided because marginal product has turned negative.

Answer: (c). Trap (a) describes Stage I, which a rational producer moves past rather than stops at. Trap (b) describes Stage III, which a rational producer actively avoids. Trap (d) wrongly claims no stage is ever chosen, when Stage II is specifically the rational choice.

Question 6

When a firm doubles all of its inputs — labour, capital, and land — simultaneously, and its output more than doubles as a result, this illustrates:
(a) Diminishing returns to scale  (b) Constant returns to scale  (c) The law of variable proportions, not returns to scale  (d) Increasing returns to scale

Accepted Answer

Scaling up every input in the same proportion and observing output rise more than proportionately is the precise definition of increasing returns to scale, a long-run concept distinct from the short-run law of variable proportions, which varies only one input while holding others fixed.

Answer: (d) Increasing returns to scale. Trap (a) describes the opposite outcome. Trap (b) would require output to rise in exactly the same proportion as inputs, not more. Trap (c) wrongly relabels a long-run, all-inputs-varying scenario using a short-run, one-input-varying concept.

Question 7

A firm's Total Fixed Cost is ₹800. At 15 units of output, Total Variable Cost is ₹3,000; at 16 units, Total Variable Cost rises to ₹3,180. What is the marginal cost of the 16th unit?
(a) ₹180  (b) ₹150  (c) ₹200  (d) ₹160

Accepted Answer

Total Cost at 15 units = 800 + 3,000 = ₹3,800. Total Cost at 16 units = 800 + 3,180 = ₹3,980. Marginal Cost = ΔTC ÷ ΔQ = (3,980 − 3,800) ÷ (16 − 15) = 180 ÷ 1 = ₹180.

Answer: (a) ₹180. Trap (b), (c), and (d) all result from either omitting the fixed cost from one of the two Total Cost figures or making a small arithmetic slip in the subtraction, producing a value close to but not matching the correctly computed ₹180.

Question 8

In a perfectly competitive market, at a firm's profit-maximising equilibrium output, price is equal to:
(a) Average cost only, with no relationship to marginal figures  (b) Marginal Revenue, Average Revenue, and Marginal Cost (P = MR = AR = MC)  (c) Marginal Cost only, with no relationship to any revenue measure  (d) Whatever the firm privately chooses to charge, since firms hold full pricing power

Accepted Answer

A perfectly competitive firm is a price taker facing a horizontal (perfectly elastic) demand curve at the market price, so Price equals Marginal Revenue and Average Revenue; profit maximisation additionally requires MR = MC, so all four measures coincide at equilibrium.

Answer: (b). Trap (a) and (c) both name only a partial piece of the full equilibrium condition. Trap (d) wrongly attributes pricing power to a perfectly competitive firm, which by definition has none.

Question 9

A profit-maximising monopolist sets output where marginal revenue equals marginal cost. At this output, the price charged is:
(a) Exactly equal to marginal cost, just as in perfect competition  (b) Always exactly equal to average cost  (c) Greater than marginal cost, since the monopolist's downward-sloping demand curve places marginal revenue below price at every output level  (d) Always equal to zero, regardless of cost conditions

Accepted Answer

Because a monopolist faces the market's entire downward-sloping demand curve, marginal revenue lies below price at every output level; setting MR = MC therefore leaves price above marginal cost at the chosen output — the key pricing distinction between monopoly and perfect competition.

Answer: (c). Trap (a) wrongly imports the perfect-competition result into monopoly, where it does not hold. Trap (b) invents a cost-price equality with no general basis in monopoly theory. Trap (d) is an arbitrary and incorrect claim unrelated to the actual equilibrium condition.

Question 10

Monopolistic competition, as modelled by Edward Chamberlin, is characterised by:
(a) A single seller with no close substitutes available  (b) A small number of interdependent sellers whose pricing decisions depend on rivals' reactions  (c) Completely homogeneous products sold by every seller in the market  (d) Many sellers offering differentiated products, each holding some limited control over price due to brand or product distinctiveness

Accepted Answer

Chamberlin's model of monopolistic competition features many sellers, each offering a differentiated product (via branding, quality, or features), giving each firm limited pricing power over its own small "brand market," even though free entry and exit in the long run still erodes economic profit toward zero.

Answer: (d). Trap (a) describes monopoly, a distinct structure. Trap (b) describes oligopoly, characterised by few sellers, not many. Trap (c) describes perfect competition's homogeneous-product assumption, the opposite of monopolistic competition's differentiated products.

Question 11

The kinked demand curve model, associated with Paul Sweezy, is used to explain which observed real-world pricing pattern?
(a) Price rigidity (stickiness) in oligopoly, where firms hesitate to change prices for fear of competitors' reactions  (b) Perfectly flexible, continuously adjusting pricing under perfect competition  (c) The single uniform price a monopolist is legally required to charge all buyers  (d) Product differentiation strategies pursued under monopolistic competition

Accepted Answer

Sweezy's kinked demand curve model explains price rigidity in oligopoly: a firm expects rivals to match a price cut (to defend market share) but not to match a price increase (happy to gain share by holding steady), producing a demand curve kinked at the prevailing price and a discontinuous marginal revenue curve that keeps price stable across a range of cost changes.

Answer: (a). Trap (b) misattributes an oligopoly-specific model to perfect competition, where prices are simply market-determined, not individually rigid. Trap (c) invents a legal pricing requirement unrelated to the model. Trap (d) misattributes the model to monopolistic competition, which is instead explained by Chamberlin's framework.

Question 12

A consumer's income rises from ₹20,000 to ₹25,000, and their quantity demanded of a good rises from 40 units to 46 units. What is the income elasticity of demand, and how should the good be classified?
(a) −0.6, an inferior good  (b) 0.6, a normal good with income-inelastic demand (a necessity)  (c) 1.6, a luxury good  (d) 0, a good with perfectly income-inelastic demand

Accepted Answer

%Δ Income = (25,000 − 20,000) ÷ 20,000 = 5,000 ÷ 20,000 = +25%. %Δ Quantity Demanded = (46 − 40) ÷ 40 = 6 ÷ 40 = +15%. Income Elasticity = 15% ÷ 25% = 0.6 — positive, so the good is normal, and below 1, so demand is income-inelastic, the profile typically associated with a necessity.

Answer: (b) 0.6, a normal good with income-inelastic demand. Trap (a) wrongly assigns a negative sign, which would indicate an inferior good — the correct computation yields a positive value. Trap (c) and (d) both result from an incorrect percentage-change computation or misclassification of the correctly computed 0.6 value.

Question 13

Charging different prices to different consumer groups for an identical product, based on differences in their willingness to pay, is known as:
(a) Predatory pricing  (b) Cost-plus (mark-up) pricing  (c) Price discrimination  (d) Penetration pricing

Accepted Answer

Price discrimination is precisely the practice of charging different prices to different buyer segments for an identical good, based on differing willingness to pay or ability to prevent resale between segments — classically categorised by A.C. Pigou into first, second, and third-degree discrimination.

Answer: (c) Price discrimination. Trap (a) names a different strategy involving deliberately low pricing to drive out competitors, not segment-based price variation. Trap (b) names a cost-based pricing method unrelated to buyer-segment price variation. Trap (d) names a strategy of deliberately low initial pricing to build market share, not a segmented-pricing practice.

Question 14

In economic theory, the short run is defined as the period in which:
(a) All inputs, including plant and machinery, can be freely varied  (b) Only labour is held fixed while capital is variable  (c) Prices are fixed by government regulation for the duration of the period  (d) At least one input — typically fixed capital or plant size — remains fixed, while other inputs, such as labour, can be varied

Accepted Answer

The short run is defined by the presence of at least one fixed input (typically plant size or fixed capital), while other inputs, such as labour or raw materials, can still be varied — this is exactly the condition underlying the law of variable proportions discussed earlier in this chapter.

Answer: (d). Trap (a) actually describes the long run, in which every input, including plant size, becomes variable. Trap (b) reverses which input is typically treated as fixed versus variable. Trap (c) invents a price-control condition unrelated to the short-run/long-run distinction, which is defined by input flexibility, not price regulation.

Practice — "Business Economics"

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