Case. One partner loves to spend “here and now”, the other saves for the future. Every purchase sparks conflict.
Model. Two different configs of one system, not a “right” and a “wrong” one. The conflict is a settings mismatch, not a human defect.
What helped. A shared budget with zones of freedom: part for a common goal, part for each person’s spending with no reporting.
Lesson. Money is a team task, not a field to prove who’s right.
See Money and housing.