  We study the formation of stable outcomes via simple dynamics in cardinal
hedonic games, where the utilities of agents change over time depending on the
history of the coalition formation process. Specifically, we analyze situations
where members of a coalition decrease their utility for a leaving agent
(resent) or increase their utility for a joining agent (appreciation). We show
that in contrast to classical dynamics, for resentful or appreciative agents,
dynamics are guaranteed to converge under mild conditions for various stability
concepts. Thereby, we establish that both resent and appreciation are strong
stability-driving forces.
