Construction trade gravity model in Australia on this basis and potential of bilateral trade flow analysis showed that bilateral trade between China and Australia has great potential, with a large room for improvement. Finally, to speed up the implementation of the China-Australia free trade agreement, create a favorable market environment, building economic and trade cooperation mechanism, deepening the industrial division of labor and other recommendations to promote the development of Sino-Australian bilateral trade.

假定一个简单国民收入决定模型中：c＝120＋0.9y，i＝30 ，g＝250，没有进出口和税收，试求： （1）储蓄函数

储蓄函数=1-c=1-0.9=0.1
均衡产出=y=c+i+g
y=120+0.9y+30+250
0.1y=400
Y=4000
投资乘数=1/0.1=10
4、非意愿存货不知道是什么。
5.2000/10= 200.

经济学中的gravity equations什么意思

gravity equations
引力方程

gravity 英[ˈgrævəti] 美[ˈɡrævɪti]
n. 重力; 万有引力，地心引力; 重要性，严重性; 严肃，庄重;

equations 英[ɪk'weɪʃnz] 美[ɪk'weɪʃnz]
n. 方程式( equation的名词复数 ); 相等; 等同看待;