how to promote sales?

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in big supermarkets,there are really many tactics to promote their sales and thus get the maximum profit margin. for example,sellers will put vinegar and sugar and salt in differents selves in order to let people pass more selves to buy their unnecessary products,because those are our daily necessities. sellers also will display fruits and fresh bread at the extrance of their supermarkets make people feel that their supermarkets sell good ,fresh and healthy food. what other tactics do u know,let's share.