This book is aimed at Analyzing the marginal Income Contribution of child labour and its determinants in rural households of Harari people National state of Ethiopia. Results show children involved in four main activities: School attendance, working, combining school and work and idle (neither attends school nor involved in work). Households were highly dependent on their children labour supply to supplement their income. Mitigation of child labour requires household's capacity building that enhances asset and capital formation, adult education and provision of productive agricultural inputs.