English version

trading stamp

From Longman Business Dictionarytrading stampˈtrading ˌstampCOMMERCE a type of stamp given by a shop to a customer each time the customer spends a certain amount of money, for sticking in a book, and which later can be exchanged for goods or moneyLast year about 25% of supermarkets were giving trading stamps. stamp
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Word of the day priceless extremely valuable