Supermarkets came into existence in the USA during the Great Depression of the thirties. However, the original supermarkets were established by independent merchants who deal with many for heterogeneous technology to achieve the business objective. The customers are to do the shopping themselves from the racks which are properly labeled and at the end of the market there is the cashier who takes the cash after weighing and checking the commodities.
Usually, the customers make their purchases and carry them in trolleys. Thus, the supermarkets are also known as self-service stores since the customers are to do all the purchasing by themselves without the aid of salesmen or selling assistants.
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