请大家帮助，谢谢~~
A conventional approach in studying the saving behavior is to regress aggregate savings on interest rates directly. If the coefficient of regression　is positive， we say the theory of saving is valid； however， if the　coefficient is negative， we say the theory is invalid. Critically evaluate　this approach. Does your conclusion depend on non-storable goods　assumption？ Explain.


我想问的是，这个方法错在哪里？