The document discusses the effects of different agricultural mechanization models on wheat production in Arsi Zone. It analyzes the profitability for smallholder farmers and service providers across mechanization levels ranging from animal draught to advanced tractor technologies. For smallholders, higher mechanization levels significantly increase gross margins while keeping costs stable. For service providers, gross income and revenues increase with each mechanization level, though annual cash flows are highest for intermediate technology during the debt repayment period of 5 years. Investment costs rise substantially with more advanced mechanization models.