This research looked into the relationship between transactions costs and agricultural household supply response with a focus on maize farmers in Oyo and Osun States of Nigeria. The research specifically analyzed the quantity of maize supplied by respondents and factors determining such quantity. Multistage random sampling technique was employed to sample four hundred maize producing farmers for the study. A structured interview schedule was used to collect primary data from the respondents. Data collected were analyzed using descriptive statistics and estimation of Cobb-Douglas regression...