Why Do Rich People Get Richer and Poor People Get Poorer?

Why do rich people get richer? It's because when their income grow higher, their lifestyle is 'flat' (delaying to enjoy pleasure). This over income, they use to invest in property, stocks, foreign currency, or grow their business bigger. So that's why their income always get higher. They reinvest their income over and over.Then, why do poor people get poorer? No matter what how many income poor people get, it all will be spent in expense. For example:As poor people get income, they will think how to spend it. They will buy bigger TV, expensive watch, newest mobile phone, expensive clothes, eat in expensive restaurant, join gym membership, etc. In short, they are present-minded, they never care of their future.