CHINESE RURAL ECONOMY (Monthly) CONTENTS No.8, 2015 (Serial No.368) On the Recycling Great Agriculture Conjoining City and Countryside ——An Ecological Perspective of Spatial Structure……………Yang Chengxun & Yang Chengyu(4) An Analysis of the Threshold Effect of Agricultural Informationization on the Increase in Agricultural Total Factor Productivity…………………………………………………Han Haibin & Zhang Li(11) Subsidization to Purchasing Agricultural Machinery, Agricultural Productivity and Transfer of Rural Labour Forces………………………………………………… Lü Wei, Zhang Xiaoying & Wang Weitong(22) Price Linkage, Market Boundary and Government Interference ——Taking the Price Linkage between Wheat, Maize and Sugar as Example………………………… …………………………………………………………………………Mao Xuefeng & Yang Jun(33) The Opening-up of China’s Grain Market and the Fluctuation in International Grain Price ——An Analysis Based on Spill-over Effect of Volatility in Grain Price……………………………… ……………………………………………………………Li Guangsi, Cao Baoming & Ma Xuelin(44) A Comparative Study on Marketing Modes and Price Formation for Vegetables ——Based on Following-up Investigation to Vegetable Marketing from Shouguang of Shandong Province toBeijing……………………………Li Chongguang, Xiao Xiaoyong & Zhang Youwang(53) Elasticities of Demand for Import of Log in China ——An Estimation with DFGLS Using Monthly Time Series………………………………………… …………………………………………………………………Zhang Han, Zhao Qing & Li Zhou(67) The Impact of International Grain Price on Imposing Restrictions on Grain Export by Major Grain Producing Countries ——Lost Avoidance Perspective……………………………Sun Lin, Pang Guanqi & Wang Jian(76) Crisis in the Discipline of Agricultural Economics and the Way for Its Development in the Future………… …………………………………………………………………………… Yu Xiaohua & Guo Pei(89) Editor-in-Chief: Li Zhou Deputy Editor-in-Chief: Du Zhixiong Code No.M861 Publisher: Chinese Rural Economy Publishing House Telephone:0086-10-85195649 Fax: 0086-10-65137559 e-mail: ruraleconomy@cass.org.cn Address: No.5, Jianguomen Nei Ave., Beijing,100732, China Overseas Distributor:China International Book Trading Corporation (P.O.Box 399,Beijing, China)