It is the famous pyramid of needs theory.
At the bottom, humans are trying to survive with needs of food, then shelter, then financial security, last the self-satisfaction is on the top of the pyramid of needs!
For poor people, individuals fight to survive, therefore, shows more human or maybe animal instincts. When individuals reachs the top of the pyramid, they no longer worried about food, shelter or financial security, therefore, self-respect and self-satisfaction become their top priority.
That's why the rich donate when they have accumulated so much wealth, yet the poor still fight a street corner to sleep.
At the bottom, humans are trying to survive with needs of food, then shelter, then financial security, last the self-satisfaction is on the top of the pyramid of needs!
For poor people, individuals fight to survive, therefore, shows more human or maybe animal instincts. When individuals reachs the top of the pyramid, they no longer worried about food, shelter or financial security, therefore, self-respect and self-satisfaction become their top priority.
That's why the rich donate when they have accumulated so much wealth, yet the poor still fight a street corner to sleep.