Why did manufacturers offer money back when paid for at time of purchase

answer:

Manufacturers do that to make their customers have a feeling of satisfaction with their purchase experience, making them likely to return to the store. This type of guarantee is particularly important for retailers who sell products online or through mail-order catalogues..

the lowest among the social higher rank were the working class. this class remained detached to the political progression   of the country and was hostile to the other two classes

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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