(北大经院)杨汝岱、田巍、刘政文、吴群锋 This paper introduces strategic interactions into a Ricardian model where two countries optimize trade policies. In a Nash Equilibrium, we find that optimal import tariffs are zer ...
ZHUHAI, Guangdong, Nov. 11 (Xinhua) -- A model of China's Haoloong space cargo shuttle will debut at the 15th China International Aviation and Aerospace Exhibition, also known as Airshow China, ...
BEIJING, Nov. 4 (Xinhua) -- The Shenzhou-18 spacecraft has returned to Earth with 34.6 kilograms of space station experimental samples, encompassing microorganisms, alloy materials and nanomaterials ...