The theories of Karl Marx has made us to understand that an equal society is possible if the society work in unity. Search has shown that 80% of relationship between societies is strictly bias and profit minded which make it difficult for equal society to exist. The rich hate the poor to reach the class and the poor hate the rich for always staying at the top. A quote says: the rich cannot sleep because the poor are awakes and the poor can not sleep because they're hungry. This are part societies from the pictures of seeing people equal or leadership doubtlessly working towards equal societies. Is any society that practice equality laws and equity for oneness in all shared resource?
There can never be a time everybody will be rich at the same time. The society does not permit that and also nature does not permit that. There must be an imbalance in society for there to be the difference between the giver and the receiver, the rich and the poor.
If everything is balanced and eventually everybody becomes rich, there won't be any story of success and failure and the whole life will not be sweet. The is why everyone tries to be in the rich category of the society and then money can flow from rich to poor.