Heterogeneous Firms and Asymmetric Product Differentiation
在线性需求、内生加价和异质性企业的模型中引入不对称产品差异化，将行业分为多个市场细分，解释企业生产率、规模与出口行为的非线性关系，并用法国葡萄酒生产商数据实证检验。
We introduce asymmetric product differentiation in a model characterized by a linear demand system, endogenous markups and heterogeneous firms (as in Melitz‐Ottaviano [2008]). In particular, a single industry is divided into a number of market segments, each characterized by a different degree of horizontal product differentiation. Such a setup allows us to explain, within a single theoretical framework, the non‐linear relations between firm productivity, size and exporting behavior that have been documented by the empirical literature. The theoretical results are tested empirically by examining the performance of French wine producers operating in market segments characterized by different levels of horizontal product differentiation. Such segments are identified using the official classification of French wines based upon the controlled denomination of origin, i.e., the Appellation d'Origine Contrôlée (AOC) system.