Making your investments visible to both partners

Name and acknowledge the shared investments in the relationship — children, history, shared projects — to both parties.

Why it works

Investment predicts commitment partly because it raises the perceived cost of leaving. But investment also has a psychological function beyond sunk costs: it signals shared history, mutual stake, and the effort that has been made. When investments become invisible or taken for granted, they lose their protective function. Making them visible restores both partners’ awareness of what the relationship already contains.

How to do it

1. List the significant investments you have made in this relationship: emotional, financial, temporal, sacrificial, shared.
2. List the investments your partner has made that you are aware of.
3. Share both lists with each other — particularly your acknowledgment of what they have invested.
4. Identify the investments you most fear losing if the relationship ended.
5. Create at least one new shared investment together — a project, plan, or commitment that extends your mutual stake.

Evidence

Investment size is one of the three stable predictors of commitment in Rusbult’s model, supported across cultures and relationship types. The mechanism includes both sunk-cost effects and the felt sense of shared stake. The Investment Model Scale (Rusbult, Martz, & Agnew, 1998) treats investment size as its own measurable dimension, distinct from satisfaction and alternatives, which is why making investments explicit can move commitment independently of how good the relationship currently feels. (observational)

High investment can maintain commitment in unhappy relationships (trap effect) — this practice is beneficial only when combined with honest satisfaction assessment.

Sources

• Le & Agnew (2003), Commitment and its theorized determinants, Personal Relationships
• Le, B., & Agnew, C. R. (2003). Commitment and its theorized determinants: A meta-analysis of the Investment Model. Personal Relationships, 10(1), 37–57.
• Rusbult, C. E. (1983). A longitudinal test of the investment model: The development (and deterioration) of satisfaction and commitment in heterosexual involvements. Journal of Personality and Social Psychology, 45(1), 101–117.
• Rusbult, C. E., Martz, J. M., & Agnew, C. R. (1998). The Investment Model Scale: Measuring commitment level, satisfaction level, quality of alternatives, and investment size. Personal Relationships, 5(4), 357–387.

Common mistake

Treating investment only as a reason to stay (sunk cost) rather than as a genuine source of value — which produces resentful staying rather than committed staying.