Imperfect Competition in Trade Quiz: Market Power

Monopolistic competition captures several key features of real-world trade in manufactured goods. Firms produce differentiated products, giving each some pricing power and a downward-sloping demand curve. Free entry ensures long-run profits are zero, preventing permanent monopoly rents. These features together allow the framework to explain both the variety of goods traded internationally and the competitive dynamics that keep prices from rising too far above costs in global markets.

The answer is True. When an industry is dominated by a few large firms, strategic trade policy can be effective. An export subsidy given to a domestic firm lowers its costs and enables it to expand output, which can force foreign rivals to reduce their output. If the domestic firm captures a larger share of global profits as a result, national welfare may increase even after accounting for the cost of the subsidy. This strategic rationale for trade policy is a key implication of trade models with imperfect competition.

Dumping involves selling goods in foreign markets at prices below average cost or below domestic prices. This practice is only possible when a firm has market power, meaning it faces different demand conditions in different markets and can price discriminate across borders. Imperfect competition is therefore a prerequisite for dumping. International trade rules under the World Trade Organization allow countries to impose anti-dumping duties when they can demonstrate that dumping is occurring and causing harm to domestic producers.

The Brander-Spencer model shows that in industries with oligopolistic competition, a government subsidy can act as a strategic commitment device. By subsidizing a domestic firm, the government effectively shifts the firm's reaction function, enabling it to commit credibly to producing more output. Foreign rivals, anticipating this higher output, reduce their own production. The domestic firm captures a greater share of global profits, potentially generating net gains for the country that exceed the cost of the subsidy.

The answer is False. While firms with market power do charge prices above marginal cost, imperfect competition in trade can still benefit consumers through product variety and economies of scale. In monopolistic competition, for example, consumers gain access to a broader range of differentiated products than would exist under perfect competition. Lower average costs from economies of scale can also partially or fully offset the markup, meaning consumers may actually face lower prices than in a fragmented perfectly competitive market.

Oligopolistic competition between two global firms can produce several outcomes. Strategic interaction may lead to overproduction as each firm tries to undercut the other, resembling a prisoners dilemma. Government subsidies can shift the equilibrium by giving the supported firm a credible commitment to expand, deterring the rival. Collusion between firms raises prices and reduces output, benefiting producers at the expense of consumers and potentially violating international competition law.

Monopolistic competition features many firms each with a differentiated product, relatively small individual market shares, and free entry and exit that eliminates long-run profits. Oligopoly involves a small number of large firms with significant market power, substantial barriers to entry, and strategic interdependence where each firm's decisions directly affect rivals. These structural differences lead to very different predictions about pricing, output levels, and the effectiveness of trade and industrial policies.

Reciprocal dumping, developed by Brander and Krugman, describes a situation where two firms from different countries simultaneously export to each other's home markets at prices below domestic levels. This two-way trade in identical goods occurs because each firm, having some market power, engages in price discrimination across markets. While this generates trade that may seem wasteful due to cross-shipping of identical goods, it also increases competition and can lower prices for consumers in both markets.

The answer is False. Imperfect competition does not necessarily reduce the gains from trade. While markup pricing means consumers pay more than marginal cost, the gains from trade under imperfect competition include access to greater product variety, lower average costs from economies of scale, and stronger competitive pressure that disciplines firm behavior. These additional sources of gains can make the total welfare improvement from trade under imperfect competition comparable to or even larger than under perfect competition.

Strategic trade policy in imperfectly competitive industries rests on three rationales. First, imperfect competition generates economic profits that a government can help domestic firms capture. Second, strategic subsidies can help firms achieve minimum efficient scale, lowering long-run costs. Third, first-mover advantages in oligopolistic markets mean that early support can create durable competitive positions. Perfect competition with free entry eliminates profits, so strategic policy is only relevant in imperfectly competitive settings.

Trade liberalization in imperfectly competitive industries introduces foreign competitors that challenge domestic firms. This increased competition forces firms to lower markups, reduce costs, and improve productivity to survive. Less efficient firms may exit, raising average productivity in the industry. This pro-competitive effect of trade is an important source of welfare gains identified in models of imperfect competition, and is one reason why trade liberalization tends to increase aggregate economic efficiency even in non-competitive markets.

The answer is True. When two countries open to trade under monopolistic competition, the total market becomes larger, which allows each surviving firm to produce at greater scale and lower average cost. However, this efficiency gain means that fewer firms are needed to serve the combined market. Some domestic firms exit as foreign varieties enter. The total number of firms in each individual country falls, but consumers gain access to varieties from both countries, so the total variety available to consumers increases.

Imperfect competition refers to any market structure in which firms have some degree of pricing power rather than being pure price-takers. This includes monopoly, oligopoly, and monopolistic competition. In international trade, imperfect competition is important because many globally traded goods are produced by a small number of large firms that sell differentiated products, charge prices above marginal cost, and compete strategically with each other across borders.

The answer is True. Both the Ricardian model and the Heckscher-Ohlin model are built on the assumption of perfect competition, where firms are price-takers, products are homogeneous, and there are no barriers to entry or exit. These assumptions simplify the analysis but fail to capture key features of real-world trade, particularly in manufactured goods markets where a limited number of large firms sell differentiated products and set prices above marginal cost.

In monopolistic competition, positive profits attract new firms into the market. As more firms enter, each firm's demand curve shifts inward, reducing its markup and profit. In the long run, entry continues until profits are driven to zero, at which point prices fall to equal average cost. Trade enlarges the market, initially allowing more varieties and scale, but long-run equilibrium features lower prices and a stabilized number of firms.