Two roles of experiments in behavioural economics are distinguished - experiments as exhibits and experiments as tests of theories. An exhibit is an experimental design which reliably induces a surprising regularity, typically combined with an informal hypothesis about the underlying causal...

This paper compares two alternative answers to the question, 'Who is the addressee of welfare economics?' These answers correspond with different understandings of the status of the normative conclusions of welfare economics, and have different implications for how welfare economics should be...