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It is covered in Agenda 21, Chapter 7 of the United Nations Framework and it is defined as the ratio between median house price and median annual household income, otherwise known as the median multiple. The World Bank also says this ratio is "possibly the most important summary measure of housing market performance, indicating not only the degree to which housing is affordable by the population, but also the presence of market distortions".
A great many people -- singlets, medians, and multiples -- are survivors of abuse. This does not prevent their being empowered, productive, or useful members of society; if they are plural, it does not mean their plurality was caused by the abuse; it does not necessarily mean they have to be in therapy for multiplicity, although therapy may be extremely useful for other aftereffects such as delayed stress.