Since most people are busy with their work and study,they seldom go shopping during the working days.At the weekend,people can't help going shopping with their family,friends,classmates and even relatives,only because they cannot resist the temptation of the advertisements and the discounting policy in the big stores.They always make a shopping list before they start.According to the shopping list,people would like to look around in the store or among the different stores.They are making the comparisions,trying to find the lowest prices.It is good for people to have the window-shopping first.It's a kind of exercises.Also,it can help people to make the final decision.