... Towards a theory of credence goods 42.1 Typesofcredencegoods 42.2 Credentialsofsellers 72.3 Supply of credence goods in customer markets . 82.4 The evolution of credence goods in customer ... toobtain more room for pigs in the stables, access to outdoor areas, allowing the pigs to act according to their natural behaviour, controlling veterinary treatmentincluding the use of medicine, ... Heijn, the biggest supermarket chain in the Netherlands, showedinterest for pigs produced in an animal friendly way. From this point of timethings moved faster. And in 1993 there were in the ISC...