There is a unique difference between Gross Disposable Income and Household disposable income.  The first being that "gross" indicates the total about amount of income derived from all sources such as wages, investments, self-employment, pensions and social benefits before extracting depreciation costs.  Household disposable income includes all sources of income less social benefits, taxes, insurance, and liabilities such as rent, electricity and other ongoing financial commitments.  What is remaining is defined as household disposable income which is then indexed globally using PPP (purchasing power parity) in order to adjust for price differences in different countries.