How did the wealthy keep the servants from remaining united?

 Becoming wealthy in the first place might seem like the hard part, but once a person has money, other real challenges present themselves: What kind of rich person does one want to be? Is a sprawling mansion or a slender townhouse preferable? Should one build a game park or an English garden? And then there is the matter of figuring out who should look after all these things. To hear the caretakers of the ultrarich describe it, the wealthiest among us are like dinghies adrift on the open sea—lost in their money and the endless options that come with it. (You could call it “Overwhelmed Billionaire Syndrome.”) Fortunately, the free market will provide: an army of experts has sprung up to help them navigate their lives.

The answer is Caste System. This social stratification is very important to many Hindus. They believed that they will go through all of these stages in life if they have done well in their current one. It is their form of social order as well as it dictates the social role of each caste.