We study the impact of loss-aversion and the threat of catastrophic damages, which we jointly call threshold concerns …, on international environmental agreements. We aim to understand whether a threshold for dangerous climate change is as an …), or low damages (gain domain). Under symmetry, that is when countries display identical degrees of threshold concern, we …

We propose a theory-based experimental approach to compare the properties of approval voting (AV) with those of … voting. Finally, subjects' behavior under AV highlights the need to study equilibria in asymmetric strategies. …