The purpose of this article is to perform a comparative exercise of the creation of values and production costs, taking as an object the cultivation of lettuce in a conventional peasant production and another agroecological production. From there, a part of the theory of value-work based on Marx is put into discussion to try to show which of the two types of cultivation work, measured in time, is greater. Based on this, an analysis of the real production costs is made and it is intended to contribute to the discussion of the trend towards the elitization of agroecological products.