This is an economic theory based on relationships in terms of trading and exchange of commodities.
We haggle and negotiate and try driving the best bargain we can.
It is based on the principle depending on the exchange of rewards and costs.
The most satisfying and enduring relationships are those that bring in the highest rewards and least costs for both parties.
Profit explanation?
For a relationship to maintain, rewards - costs should result in a positive outcome for each individual.
Thibault and Kelley (1959) believed that individual members of a relationship are motivated to maximise their rewards but decrease their costs as well.
Rewards and costs are subjective; you may consider receiving a compliment from your partner in exchange for sex, companionship etc.
The cost may be effort, financial cost or missed opportunities
What is comparison level?
Thibault and Kelley propose we develop a comparison level - a standard against which all our relationships are judged.
Comparison level is a mix of our past experiences along with a general view of what we expect from our relationships or may be influenced by media.
This can change as we get more experiences under our belt.
If the potential profit or actual profit exceeds our CL, the relationship will be judged as worthwhile.
If the final result is negative, we will be dissatisfied.
What is comparison level - alternatives?
This is where the person weighs up potential rewards from someone else against costs with ending their relationship.
A new relationship may take place if the current one is lower in profit.
Supporting evidence for SET?
Sprecher (2004) - They conducted a longitudinal study of 101 dating couples at a US university and found the presence of alternatives was the biggest predictor of relationship satisfaction.
There was a strong negative correlation between number of alternatives and relationship satisfaction.
More alternatives = less satisfaction.
They concluded that having more comparisons for alternatives means you are likely to breakdown your relationship.
Negative evaluation with SET validity?
Another problem is that the majority of studies to support SET use artificial tasks.
One procedure involves two strangers in a game situation where they distribute rewards and costs.
They know nothing about each other and the relationship consists solely of the game.
This has been generalized to everyday relationships.
Therefore, it lacks ecological validity and realistic studies using real couples have been less supportive of this theory and theory may not be valid.
Negative evaluation regarding vague nature of SET?
This theory suggests that partners measure costs and benefits but it is unclear.
How do you compare the benefit of seeing your children every day to arguing with your partner?
It is unclear what the value of the CL and CLalt need to be to threaten a relationship; how attractive is the alternative?
It is not possible to measure it so it cannot be a valid explanation of relationships.
Negative evaluation regarding reductionism?
SET can be criticised as being reductionist as it simplifies relationships to profits and losses.
It ignores reproductive success and strategy.
It also ignores emotion as people in unrewarding relationships may stay due to loving their partner.
They may also be defensive despite their other being abusive.
It also argues that partners are out to maximise profit in relationships but does not account for equity or fairness.