Two-Step Optimization Method for Multi-objective Crop Planning Problem in Contract Farming System

This study examines a contract farmer system between a public institution and farmers from the perspective of mathematical optimization, with local production for local consumption of agricultural products in mind. Specifically, it is considered to stabilize the profits of local farmers by maximizing their agricultural output, while at the same time maximizing the profits (or minimizing the costs) of the public agency. The proposed problem is formalized as a multi-objective optimization problem, and the optimal solution cannot be obtained directly. Therefore, in this study, the proposed mathematical programming problem is solved in two steps to obtain the optimal solution, taking into account the importance of the objective function.