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The impact of irrigation development on rural farmers is a complex and difficult subject as the distribution of gains from irrigation development depends on a host of factors which go far beyond the primary crop production activity. Crop processing industries are stimulated; higher farm incomes mean more household expenditure, which stimulate retail trade; service industries like transportation; get more business. Further, irrigation development affects almost all sectors of the economy. Some studies have quantified these secondary benefits as roughly equal to the primary benefits of crop output.