An extensive number of studies have proven its benefits for public health (e.g. lower spread of HIV/AIDS; better vaccination; prevention and medication of disease; better nutrition; lower maternal, infant, and child mortality), demography (e.g. longer life expectancy, accelerated demographic transition through better birth control) and the economy (e.g. increased purchase power, increased productivity in traditional sectors, increased demand on service sectors). Other benefits, although more difficult to measure, include a beneficial impact on democracy, human rights, governance, and political stability through increased understanding of non-violent ways to solve problems and mutual understanding between groups in conflict.[6][7]