According to the classical Nerlove-Arrow model, Lutha and Virtanen created the nonlinear advertising capital model with time delayed feedback via advertising expenditure and stock of goodwill.

• 具有时滞的非线性广告投资模型正是在这种情况下，Lutha和Virtanen在经典的Nerlove-Arrow模型的基础上，通过在广告支出和商誉积累之间加上非线性反馈项和时滞项后所得到的模型。