A study on Song Tao's economic thoughts Study on Song Tao's economic thoughts A study on Zhang Xunhua's economic thoughts A study on Wu Xuangong's economic thoughts A study on Chen Zheng's economic thoughts A study on Liu Guoguang's economic thoughts Study on Zhang Xunhua's economic thoughts Study on Wu Xuangong's economic thoughts Study on Chen Zheng's economic thoughts A study on Shen Deqian's poetic thoughts