PSP

When analyzing the impact of the Price Support Policy (PSP), data on grain prices, import and export volumes, and production levels were used. The price data included domestic purchase prices and international market prices for major grains such as rice and wheat. Import and export statistics were sourced from customs databases, covering annual trade flows over the study period. Production data encompassed total output, yield per unit area, and sown area, derived from national agricultural statistical yearbooks. All data were cross-verified for consistency and reliability before being incorporated into the analysis.在分析价格支持政策（Price Support Policy, PSP）的影响时，本研究采用了粮食价格、进出口量以及生产水平相关数据。其中价格数据涵盖水稻、小麦等主要粮食品种的国内收购价格与国际市场价格。进出口统计数据源自海关数据库，覆盖研究周期内的年度贸易流量。生产数据包含总产量、单位面积产量与播种面积，均来自全国农业统计年鉴。所有数据在纳入分析前均经过一致性与可靠性交叉验证。