An instructive look backwards: "If you don't need it, DON'T BUY IT!"

This is from the back of a ration book from World War II in my name: "NEVER BUY RATIONED GOODS WITHOUT RATION STAMPS. NEVER PAY MORE THAN THE LEGAL PRICE. IMPORTANT: When you have used your ration, salvage the TIN CANS and WASTE FATS. They are needed to make essential supplies for the battle fronts and the home front Cooperate with your local Salvage Committee." And this is from the back of a ration book of a family member: "1.This book is valuable. Do not lose it. 2.Each stamp authorizes you to purchase rationed goods in the quantities and at the times designated by the Office of Price Administration. Without the stamps you will be unable to purchase those goods. 3.Detailed instructions concerning the use of the book and the stamps will be issued from time to time. Watch for those instructions so that you will know how to use your book and stamps. 4.Do not tear out stamps except at the time of purchase and in the presence of the storekeeper, his employee, or a person authorized by him to make delivery. 5.Do not throw this book away when all of the stamps have been used, or when the time for their use has expired. You may be required to present this book when you apply for subsequent books." And then it goes on to say: "Rationing is a vital part of your country's war effort. This book is your Government's guarantee of your fair share of goods made scarce by war, to which the stamps contained herein will be assigned as the need arises. Any attempt to violate the rules is an effort to deny someone his share and will create hardship and discontent. Such action, like treason, helps the enemy. Give your whole support to rationing and thereby conserve our vital goods. Be guided by the rule: 'If you don't need it, DON'T BUY IT!'"