Rusbult and Van Lange (1996): to understand why people stay in relationships we have to take into account the level of investment. The best indicator of whether or not a couple will stay together is commitment, this is made up of many factors including:
-Satisfaction with the relationship, belief that it is better than alternative relationships and substantial investment in the relationship.
The key difference between this and SET is that the emphasis is on investments rather than costs.
Rhahgan and Axsom (2006): large study into women living in refuge, they found that the factors outlined by the Investment Model contributed to the women's commitment to stay with their partner.
Jerstad (2005): studied both men and women, found that investments especially the amount of time and effort put into the relationship were the most important predictor of whether or not someone would stay with a violent partner.
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