In the development discourse, the basic needs model focuses on the measurement of what is believed to be an eradicable level of poverty. Development programs following the basic needs approach do not invest in economically productive activities that will help a society carry its own weight in the future, rather they focus on ensuring each household meets its basic needs even if economic growth must be sacrificed today. These programs focus more on subsistence than fairness. Nevertheless, in terms of "measurement", the basic needs or absolute approach is important. The 1995 world summit on social development in Copenhagen had, as one of its principal declarations that all nations of the world should develop measures of both absolute and relative poverty and should gear national policies to "eradicate absolute poverty by a target date specified by each country in its national context."