output  production consumption  这三者之间是个什么关系  什么时候平衡   比较迷惑概念

附题~
C=160+0.6Yd   
I=150
G=150
T=100
a.solve the equilibrium output。 compute total demand. Is it equal to production？
b. assume that G is now equal 110. solve for equilibrium output. compute total demand. is it equal to production？
c. assume that G is 110, so output is given by your answer to (b)。 compute private plus public saving. is the sum of private and public saving equal to investment?

主要是概念不清楚，题目到会作，新人木有奖励 - -  求好心人解答
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