Abstract
The current world food system gives priority to efficiency and profitability, creating some environmental and inequality problems in the world. In order to re-optimize our food system, we have developed a food system model to adjust the efficiency, profitability, fairness and sustainability of the food system. First of all, we describe the positive and negative effects of food systems optimized for fairness and sustainability, respectively. We have established the index system, and on the basis of the existing data, we use the grey prediction and fitting method to obtain the future data of each index. After that, we divide the previous 12 indicators into benefit category and cost category, and use entropy method to get the weight of indicators that affect benefit and cost each year. We use the “scale factor” method to quantify indicators that are difficult to measure, build models to calculate cost and benefit priorities for changing the world food system, and chart changes that benefit cost ratios in different years.
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