Collect a great deal of materials on commodity prices and then have the prices of rice, salt, tea, horse, tough silk cloth counted, graphed and analyze the changing trend of various prices.

• 其三、大量的收集明代的物价资料，然后分门别类的统计明代的米价、盐价、茶价、马价、绢布价，绘制成图表，并分析各种物价变化的趋势。