Microeconomics and Pricing

Monopolistic markets are characterized by: (1) Price set above marginal cost, (3) Preservation of excess profits (barriers to entry), (4) Absolute product differentiation, and (6) No direct competitors (limited competition). This distinguishes monopolistic competition from perfect competition where price equals marginal cost and competitors are infinite.

“Peak oil” is the period when the maximum rate of global petroleum extraction is reached, after which the rate of production enters terminal decline. It relates to a long term decline in the available supply of petroleum.

Perfect competition requires: many buyers and sellers, homogeneous products, free entry and exit, perfect information, and perfect mobility of factors. Transportation costs are not essential - models can include or exclude them. In reality, transport costs exist but are small enough not to significantly affect competition. The other three listed conditions are fundamental requirements.

Price takers (firms in perfect competition) face horizontal demand curves at the market price - they can sell any quantity at that price but cannot influence it. TR = P×Q and MR = P are correct price taker characteristics. AR = P is also true since average revenue equals price for all firms. A negatively sloped demand curve would give the firm price-setting power, contradicting price-taking behavior.

A monopoly is characterized by a single firm, unique product, and some advertising (to maintain market position). The key characteristic is that the monopolist is a price MAKER, not a price taker - they have market power to set prices. Being a price taker is the exception as it contradicts the fundamental nature of monopoly power.

A monopolist maximizes profit by producing the quantity where marginal cost equals marginal revenue (MC = MR). At this point, the additional revenue from selling one more unit equals the additional cost of producing it. Producing beyond this point would reduce profit since each extra unit would cost more than it earns in revenue. The monopolist does not maximize at minimum average cost or maximum output - profit maximization occurs specifically at the MC = MR intersection.

Price discrimination is profitable only when different market segments have different price elasticities of demand. The monopolist charges a higher price in the less elastic market (where consumers are less sensitive to price) and a lower price in the more elastic market (where consumers are more price-sensitive). If elasticities were uniform, charging different prices would simply shift sales between markets without increasing total profit.

Agricultural markets most closely resemble perfect competition because there are many buyers and sellers, products are largely homogeneous (standardized commodities), and there are few barriers to entry or exit. Individual farmers are price takers - they cannot influence the market price and must accept the prevailing price for their produce. This is unlike monopoly, oligopoly, or monopolistic competition where firms have some degree of market power.

The kinked demand curve model assumes that if an oligopolist raises prices, competitors will NOT follow (to gain market share), making demand above the kink highly elastic. However, if the oligopolist lowers prices, competitors WILL match the price cut to avoid losing customers, making demand below the kink relatively inelastic. This creates a kink at the current price and explains why prices tend to be rigid in oligopolistic markets.

Final consumption demand arises in both household and government sectors. Households demand goods and services for personal consumption, while the government demands goods and services for public consumption and administration. This is a fundamental concept in national income accounting. Options A and B are incomplete as they consider only one sector, while D is incorrect as both sectors contribute to final consumption demand.

Diminishing marginal returns occur when adding more of a variable input (like labor) to fixed inputs (like capital) results in progressively smaller increases in output. This means each additional unit of input produces less extra output than the previous unit, so the cost of that extra output (marginal cost) rises. Option C correctly identifies this relationship. Options A and B incorrectly suggest costs decrease, when they actually increase at the margin.

Average fixed cost (AFC) equals total fixed cost divided by output quantity (AFC = TFC/Q). Since fixed costs don't change with output, as output (Q) increases, the same TFC is spread over more units, causing AFC to continuously decrease. Option B is correct. Option A is opposite of what happens. Option C would only be true if fixed costs changed proportionally with output (impossible by definition). Option D describes average total cost behavior, not AFC.

When price falls and total expenditure decreases, demand is inelastic (elasticity < 1). This happens because the percentage increase in quantity demanded is smaller than the percentage decrease in price. With elastic demand (elasticity > 1), a price decrease would increase total expenditure because quantity rises proportionally more.

At the exact midpoint of a linear demand curve, point elasticity equals 1 (unit elastic). This is a mathematical property of linear demand curves - the midpoint divides the curve into an elastic portion (above midpoint) and inelastic portion (below midpoint).

In perfect competition, firms are price takers and sell each unit at the same market price. Therefore, AR (average revenue) = MR (marginal revenue) = Price. In other market structures, AR > MR because firms must lower price to sell more units.