With regard to the adjustment of the social security payment base for employees in ordinary enterprises, according to the relevant regulations, the upper and lower limits of the basic old-age insurance payment base will be raised from July 1, 2021. At present, the lower limit of the old-age insurance payment base (June 2021) is 3,469 yuan, and the upper limit is 20,400 yuan. So who will be affected by the increase of the upper and lower limits of the basic old-age insurance payment base?