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People buy because there is a demand for an item. Otherwise people just buy because they are stressed and dont completely have any need for the item they bought. You buy food because you need to eat in order to survive, rather than just buy food and display them on your fridge.
Factors such as needs, wants, and emotional reaction cause customers to buy things. Each of these factors provides a stimulus for the customer to shop, compare, and possibly purchase a product or service.
