Time is everything for those living at the foot of the social ladder. People in upper class set rules of game to control the world and enjoy everything at the cost of grassroots’ lives. Time can fly from underclass to upper class anytime as long as the rich are willing to do it. 

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It is kind of a "killing game" in which the poor die one by one while the rich approach living an eternal life. Rich people have all kinds of resources and unlimited amount of time, but their desires are still endless... The poor have no choice but to wait for death. The unfair survival mechanism pushes the poor to work hard in exchange for a meager amount of time for survival.