Sesame seed is the most important cash crop in major regions of Ethiopia. Farmers in the sub sector generated the biggest share of income from sales of sesame seeds. In this book, it is indicated that 94% of sesame production is supplied to the market. Major determinant factors for market supply were estimated by OLS regression. Sesame market performance was measured using indicators of marketing margins and levels of market integration. Major marketing cost components were identified and transport cost has been identified as the major cost constituent. Market concentration ratios of traders were measured using CR4 market concentration measures. From the analysis, it is proved that there existed tight oligopoly at different market levels.This book will be useful to marketing researchers, economists, policy makers, and any development practitioners