糧食統購統銷 1959~1961年大饑荒 周期性飢荒 人均糧食攝入 地方政治文化 信息故障 定購 食品權利 長期的糧食短缺 陳雲 薄一波 超購 United grain procurement and marketing The great famine of 1959~1961 Periodical famine Per capita grain intakes Local political culture Intelligence failure Fixed purchase Entitlement to food Chronic food shortage Chen Yun Bo Yibo Above quota purchase