Fish market integration and demand analysis: a Mediterranean case study
研究了在需求分析前划定市场边界的重要性，以亚得里亚海北部为例，通过价格关系定义市场边界，并分析三种底栖鱼类产品的需求，发现市场整合程度因物种而异，高经济价值物种整合度更高。
This study discusses the importance of delineating market boundaries prior to undertaking demand analysis. The Northern Adriatic Sea is considered a good case study by which to test this approach, given the richness of species landed there and their heterogeneous distribution across the space involved. Three groups of demersal species (whitefish, cephalopods, and crustaceans) are chosen for the study. First, geographical market boundaries are defined for each product (species) using price–price relations between market places. Second, demand is analyzed inside the defined market area through the linear approximation of the inverse almost ideal demand system. Geographical market integration bears several patterns of complete or partial integration, depending on the species. It could be said that integration is higher for species of high economic relevance among regions where large quantities are landed. For all product groups, our estimations suggest that moderate substitution effects do exist among species. The characteristics of the fleets and of the buyers, as well as the biophysical attributes of the sea basin (i.e., species richness and heterogeneous spatial distribution) are discussed as explanatory variables of market integration/segmentation.