Price–Cost Margins and Structural Change: Sub‐Contracting within the Salmon Marketing Chain

摘要: Some recent studies have benefited from advances in time series econometrics order to evaluate price transmission mechanisms along the marketing chain. Due length of series, structural changes may affect evaluation price–cost margins. In case fresh salmon trade between Norway and France, gross margin producers retailers has changed level January 1988 December 1999. This article accurately identifies date a change using range ADF testing procedures (Gregory–Hansen tests, forward backward recursive tests), before looking for causes through survey. Two major factors can be identified: product form channel. Interestingly, both increasing processing development supermarket chains resulted new role intermediaries, shifting mere commercial intermediation sub-contracting big retailers.