We report an experiment using a design that permits the direct measurement of individual decision rules in voluntary contribution games. We estimate the distribution of altruism in our subjects and find that observed "overcontribution" is attributable to a combination of random variation in behavior and a few altruistic players. We also employ Andreoni's partners/strangers design to measure rep...

Abstract Familiar strangers—individuals related through regular and repeated visual encounter occurring without verbal interaction—may reduce the risk of crime at places by increasing guardianship internal motivation for norm compliance. This study examines association between familiar stranger presence incidents theft disorder train stations using transit smart card data 22 across a six-month ...

We study how group size a ects cooperation in an in nitely repeated n-player Prisoner's Dilemma (PD) game. In each repetition of the game, groups of size n ≤ M are randomly and anonymously matched from a xed population of size M to play the n-player PD stage game. We provide conditions for which the contagious strategy (Kandori, 1992) sustains a social norm of cooperation among allM players. Ou...

BACKGROUND Cryptomarkets are digital platforms that use anonymising software (e.g. Tor) and cryptocurrencies (e.g. Bitcoin) to facilitate trade of goods and services, most notably illicit drugs. Cryptomarkets may reduce systemic violence compared with in-person drug trading because no face-to-face contact is required and disputes can be resolved through a neutral third party. In this paper, we ...

In this paper we describe a virtual instrument or a performance space, placed at Høje Tåstrup train station in Denmark, which is meant to establish communicative connections between strangers, by letting users of the system create soundscapes together across the rails. We discuss mapping strategies and complexity and suggest a possible solution for a final instance of our interactive musical pe...