Many commodities are such that the utility they create for individual consumers depends positively on the number of people also consuming these goods. Prominent examples among others are mobile phones, game consoles, and computer software. The customers form a network, where the size of the...

Essential characteristics of corruption are (1) a reciprocity relationship between briber and public official, (2) negative external effects to others, and (3) high penalties for the parties involved in case of discovery. We separate the behavioural influences of these factors in a laboratory...