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乘数理论和加速理论是宏观经济学中的重要内容，其反映了国民经济内部之间的联系性，但西方学者对这些理论的论证方法却是微观性质的，论证过程是片面的，结论是错误的。投资（需求）乘数和需求加速并不是两个常数，而是两个随经济条件变化而不断改变的变数，其值在正负的原加速值与乘数值之间运动。由此，需求增加既可促使经济增长，也可导致经济衰退。一定量增量需求在运动中产生的加速作用与乘数作用之间有一定的转换关系，这种关系之和形成增量需求的经济增长贡献值，其值同样是随经济条件而变化的。
Multiplier theory and accelerating theory are important contents in macroeconomics, which reflect the connection between the internal parts of the national economy. However, the method of argument of these theories by western scholars is micro-type. The process of argumentation is one-sided and the conclusion is that Incorrect. The investment (demand) multiplier and demand acceleration are not two constants, but two variables that change continually as the economic conditions change. Their values move between positive and negative original accelerations and multiplier values. As a result, increased demand can either promote economic growth, but also lead to economic recession. A certain amount of incremental demand in the movement of the accelerating effect and the multiplier effect of a certain conversion between the relationship and the formation of incremental demand incremental contribution to economic growth, its value also varies with economic conditions.