What does 70/30 mean in a relationship?

In modern relationships, couples often struggle to maintain balance, especially when life’s stressors affect emotional and practical contributions. The “70/30” concept, used by many couples therapists, offers a framework to understand the natural ebb and flow of effort and support in a partnership. This idea suggests that, at times, one partner may carry roughly 70% of the emotional or practical load while the other contributes around 30%, depending on circumstances.