Mao Zedong wrote to honor an 8-year-old boy, Chen Yongkang, who helped police catch a spy in Suzhou, in 1951. Mao asked all kids to study hard to do a better job for the country. Banners with this slogan could be seen in almost every classroom。
This allowed people to get certain food supplies under the planned economy. Low agricultural production meant insufficient food supplies and a quota system and the coupons were a means of distribution. The quota system lasted to the early 90s. The tickets are now the stuff of collectors。