There were special offers in all the supermarkets. Some things were on sale at reduced prices or with free gifts. Many of these offer were very temping and shoppers very often took advantage of them. However, the shoppers sometimes later regretted buying them because they were not really needed and were a waste of money. In addition, nearly all the shoppers automatically assumed that when they bought more of a is not. As a result, a few shoppers always carry calculators around with them to make sure that they pay the lowest price for the products they buy