Microeconomics and Pricing

Monopolistic competition has excess capacity because firms produce at less than optimum scale in long run equilibrium (tangency of AR and AC occurs on downward sloping portion). Perfect competition has zero excess capacity. Monopoly and oligopoly don't fit the description of normal profits with excess capacity.

The question asks for the INCORRECT statement. In perfect competition, firms are price takers and CANNOT practice price discrimination - all units must sell at market price. Statement C incorrectly suggests it's beneficial to discriminate in perfect competition, which is impossible.

Price discrimination works when different market segments have different price elasticities. The firm charges higher prices in less elastic (inelastic) markets and lower prices in more elastic markets to maximize total revenue. If elasticities are same, discrimination is pointless.

Producer equilibrium occurs at the tangency point between the isocost line (cost line) and isoquant (output curve). At tangency, the producer achieves the maximum possible output for a given cost, or minimizes cost for a given output level. Above, below, or cutting are not equilibrium positions.

When percentage change in quantity demanded equals percentage change in price in absolute terms, elasticity = 1, which is unit elastic. Here, both changes are 10%, so elasticity = |-10/10| = 1. Inelastic would be < 1, elastic would be > 1, zero elastic means perfectly inelastic.

Demand for intermediate consumption (raw materials, components, services used in production) arises in all producing sectors of the economy - agriculture, manufacturing, and services. Every producer needs inputs to create outputs. Household consumers are final consumers who don't use intermediate goods for production. Both government and corporate enterprises are only part of the producing sectors.

The average revenue (AR) curve is identical to the demand curve because AR = Total Revenue/Quantity = Price × Quantity/Quantity = Price. Since price is determined by the demand curve, AR curve and demand curve are the same. Options A, C, and D are incorrect - profit curve, average cost curve, and indifference curve are different concepts.

A monopolist maximizes profit at the output level where Marginal Revenue (MR) equals Marginal Cost (MC). At this point, producing one more unit would cost more than it would add to revenue (MC > MR), and producing one less unit would sacrifice profit (MR > MC). Options A, B, and C are incorrect - maximum output, high price, or minimum average cost do not guarantee profit maximization.

Under perfect competition, each firm faces a perfectly elastic (horizontal) demand curve because it is a price taker - the market price is determined by industry supply and demand, and the individual firm cannot influence it. The firm can sell any quantity at the market price but none above it. Options B, C, and D are incorrect - the demand curve is neither vertical, upward sloping, nor downward sloping for a perfectly competitive firm.

The demand curve is also known as the average revenue (AR) curve because AR = Price, and the demand curve shows the relationship between price and quantity demanded. This is the same concept as question 204696 but asked in reverse. Options A, C, and D are incorrect - profit curve, average cost curve, and indifference curve are distinct economic concepts.

A horizontal supply curve indicates perfectly elastic supply - firms can supply any quantity at the given price, and elasticity of supply equals infinity. This means even a tiny price decrease would reduce quantity supplied to zero, while a tiny price increase would lead to unlimited supply. Options A, C, and D are incorrect - the elasticity is neither zero, one, nor between zero and one.

As a person consumes more units of a good, the additional satisfaction from each extra unit decreases. The first glass gives maximum satisfaction to a thirsty person, but each subsequent glass provides less utility than the previous one. This is a fundamental principle of consumer behavior explaining why demand curves slope downward.

The elasticity of substitution measures how easily consumers can substitute between two goods when their relative prices change. It can range from zero (perfect complements used in fixed proportions) to infinity (perfect substitutes). Claiming it is always zero is incorrect because elasticity varies depending on the nature of goods and consumer preferences. Indifference curves do slope downward, and their convexity does imply diminishing marginal rates of substitution.

An oligopoly is a market structure characteristised by only a few sellers.

High level of competition is the reason for rising promotion cost and shrinking profits.