  Purely affective interaction allows the welfare of an individual to depend on
her own actions and on the profile of welfare levels of others. Under an
assumption on the structure of mutual affection that we interpret as
"non-explosive mutual affection," we show that equilibria of simultaneous-move
affective interaction are Pareto optimal independently of whether or not an
induced standard game exists. Moreover, if purely affective interaction induces
a standard game, then an equilibrium profile of actions is a Nash equilibrium
of the game, and this Nash equilibrium and Pareto optimal profile of strategies
is locally dominant.
