●Accelerator model(加速模型) The model according to which investment depends on the change in output. N=BY I=△N=BAY N是经济的存货量，I是存货投资一是存货量的变动△N⚫ Accelerator model(加速模型) The model according to which investment depends on the change in output. N = ßY I = N = ßY N是经济的存货量, I 是存货投资—是存货量的变动N