People want to maximise rewards (e.g. companionship, sex, being cared for) and minimise costs (e.g. effort, financial investment, time wasted) in a relationship.
The more profitable the relationship the better (the higher the rewards in comparison to the costs)
Comparison level for alternatives (based on past exeriences + expectations) is developed to judge if someone else offers something better or worse than the current partner
Comparison level for alternatives = potential increase in rewards from new partner - cost of ending the current relationship
The current relationship could be replaced if the profit level is higher in a new reationship.
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