Maurya Empire and Gupta Empire are the most significant but there has been more than that.
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Social Darwinism viewed the wealthy aristocracy, or upper class, as having the most socially valued class. It was believed that social status was largely heredity. This means that the social classes were divided due to genetics.
British aristocracy had a lot of money but in general they weren't allowed to do any work. They would have to devote to things like art or or philosophy or such things. They used the money to invest into businesses and participate in such a way that was allowed for them by the society. They helped develop numerous new innovations with their money.
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In simple words, Representative surveys are valuable because they mean that the questionnaire contains all different categories of individuals and also that the correct blend of individuals is questioned. Your results will be skewed if your study isn't representative. The poll's inconsistency was due to an unbalanced, non-representative sample.