Because economic variable time series are mostly non-stationary series, there will be a pseudo-regression phenomenon if non-stationary data is used for modeling.
Because most of the time series of economic variables are non-smooth series, there is a pseudo-regression phenomenon if you use non-stable data to model them.
Because the time series of economic variables are mostly non-stationary series, if we use non-stationary data to model, there will be pseudo regression phenomenon.