Monopolistic Competition and International Trade Dynamics
Summary
Monopolistic competition describes markets in which numerous firms produce differentiated products and operate under increasing returns to scale. In the context of international trade, this framework explains how trade liberalisation and market integration reshape firm behaviour, market structure and welfare. Differences in productivity across firms drive self-selection into export markets, while larger market size and freer trade amplify competitive pressures. These pressures induce firms to innovate, expand scale and adjust markups, with aggregate gains arising from both within-firm productivity improvements and reallocation of market shares. Transport costs, often modelled as “iceberg” costs, alongside consumer preferences for variety, determine the spatial distribution of production and trade flows. The interplay between product differentiation, firm heterogeneity and trade policy yields rich dynamics: trade openness can reduce average markups through intensified competition or raise them by enabling firms to exploit scale economies in larger markets. Empirical and theoretical advances have deepened our understanding of how global value chains, differential tariff reductions and non-tariff measures alter the equilibrium number of firms, average quality levels and welfare outcomes worldwide.
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Monopolistic Competition and International Trade Dynamics publication trend
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Technical terms
Monopolistic competition: Imperfectly competitive market structure characterised by many firms producing differentiated products and facing downward-sloping demand.
Firm heterogeneity: Variation in productivity or efficiency across firms that affects their pricing, scale and export decisions.
Iceberg transport costs: Modelling device where a fraction of goods “melts away” during shipping, capturing distance or trade-barrier effects.
Elasticity of substitution: Measure of consumers’ willingness to substitute between differentiated varieties in response to relative price changes.
Markup: Ratio of price over marginal cost charged by a firm, reflecting market power and competitive pressure.
CREMR demand function: Demand specification under which marginal revenue elasticity remains constant with respect to revenue changes, yielding tractable markup distributions.
References
- The Open Monopolistic Competition Models: Market Equilibrium and Social Optimality. Mathematics (2023).
- Markups in a two-country monopolistic competition model of trade with heterogeneous consumers. Journal of Economic Structures (2020).
- The Impact of Trade Competition on Managerial Incentives and Productivity. Journal of International Business Research and Marketing (2022).
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