2. Material and methods
Questionnaire-based personal surveys were carried out on two cross section samples (n1 = 364; n2 = 374) on managers from retail meat stores or meat sections (210 butcheries and 160 supermarkets) in the city of Zaragoza, in the Autonomous Region of Aragón. Each meat store was surveyed twice, in 2006 and 2011. The same stores were surveyed in both years and the interview was always directed to the managers of the meat section or butchery, independently of the person in charge at the time of the interview. However, in most cases (≥ 90%) the same person was in charge. Zaragoza is located in NE Spain and is typically used as a model for social and market studies and could be considered as a good representation of the average Spanish population (Camarena et al., 2011, Gracia and Zeballos, 2005 and IAEST, 2010). The stores surveyed represented 95% of all commercial retailers in the city. Regarding store type, traditional butcheries were predominant and they sell fresh meat products.