In families of wealth, one family member may engage in a casual, committed, or marital relationship with another person who comes from a significantly different economic background. This situation is often portrayed as inherently stressful or fraught with difficult power or trust dynamics, particularly if the woman in the relationship is the wealthier partner.  Terms for this type of relationship have traditionally included fiscal unequals or cross-class relationships.   

A more modern and potentially less biased term is to refer to a couple as having economic diversity in their financial origins, background, or current status.  This has been compared to other common forms of relationship diversity such as racial, religious, ethnic, or even political diversity. Referring to a couple as having fiscal or economic diversity places their differences in context and conveys fewer implications about the degree of stress a couple may face or their long-term chances of success or failure.