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Agriculture has wide-ranging global impacts which extend to economic growth, poverty reduction, food security, livelihoods, rural development and the environment (Green et al., 2005). Agriculture is the main source of income for around 2.5 billion people in the developing world (FAO, 2003, p. 1). In addition, around 70 percent of the global extreme poor -or over one billion people -lives in rural areas in low and middle income countries (IFAD, 2010, p.233), most of whom rely directly or indirectly on agriculture for their livelihoods. Investment in agriculture has been shown to have beneficial impacts on agricultural growth and poverty reduction Moreover, the poorest population quintiles benefit significantly more from agricultural growth than growth in other sectors of the economy (United Nations, 2008; World Bank, 2007).
Waddington et al. (Sun,) studied this question.