A03

• likely that investment cost is a concept that applies to multiple cultures, however with differing considerations of what counts as an investment
• le and agnew in a meta analysis demonstrated that the model applies to at least five cultures and homosexual couples
• the correlational method used by most research on theories of relationships is problematic
• it may be that high investment is a result of high commitment, not other way around
• rusbults investment model is able to explain many relationships that set and equity theory cannot, such as why abused partners with very low profits will remain in a relationship
• how satisfying relationship may end due to presence of an attractive alternative and low investments
• investment model has been criticised for being too simplistic and ignoring the role of emotions in relationships
• investment model can't predict when people leave relationships because it doesn't take into account factors like jealousy or infidelity