Shopping rebates are a form of promotion. Common types of rebates are cash, vouchers or other gifts. The actual operation of shopping rebates refers to a disguised discount promotion adopted by merchants in order to earn more profits.
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As you mentioned shopping cash back, in fact, it means that after you buy a product in the merchant, the merchant returns part of the profit to the consumer in order to give back or attract customers to patronize again, but in fact the merchant still makes money, the difference between earning more and earning less knowledge.
Cash back means that in order to promote sales, the manufacturer will give you a cash back when you buy the latest model of mobile phone in the physical store, which is equivalent to a discount for you. This is a common sales method. The value of the phone itself will not be higher than the current price in the physical store. You use a relatively high price to buy and then return money to you, and finally you still pay.