Question: where does the saying brownie points come from

title: Brownie points
text: A popular marketing practice employed by many stores in post-World War II US was the distribution of stamps with each purchase . The number of stamps given out varied with the amount of the purchase . These stamps were collected by customers and later redeemed for household gifts . The earliest of these stamps were brown in color and known as `` brown stamps '' or `` brown points '' . The relationship between a purchase and the collection of these `` brown points '' equated with doing a good thing ( supporting the local vendor ) and getting a bonus ( the valuable stamps ) . Purportedly , the collection of these `` brownie points '' eventually evolved into the modern usage . The term Browniepoints is still used as a marketing practice in business today by a New Zealand power company and also used by a gift service .