The use of economic evaluation methods for agricultural projects in recent years is growing rapidly and systematically worldwide. Agricultural productions are now seen as corporate projects. Large corporations invest large sums of money in the elaboration of projects, including high technology projects and high returns. The Monte Carlo method is rich in details that help decision making in highly uncertain systems, such as in the agribusiness market, where agricultural uncertainties are huge, where climate and market uncertainties influence the construction of every detail of the project.