Ideally we would like subjects of experiments to be perfect strangers so that the situation they face at the lab is not just part of a long run interaction. Unfortunately, it is not easy to reach those conditions and experimenters try to mitigate any effects from those out-of-the-lab...

Ideally we would like subjects of experiments to be perfect strangers so that the situation they face at the lab is not just a part of a long run interaction. Unfortunately, it is not easy to reach those conditions and experimenters try to mitigate any effects coming form these out-of- the-lab...