If everybody is rich, then nobody is rich. Rich is a relative term, and it is only meaningful in comparison to everyone else. If everyone had a billion dollars, would everyone be rich? No, because then everything would cost unquantifiably more and you would be in the same situation where you are now, where you have a billion dollars but being reach means having 100 trillion dollars. There are limited goods and services available for purchase, and everyone is competing for them. The "rich" at any point in time are the people who can afford more of the goods and services than everyone else, so everyone having a billion dollars would only mean that it takes tens of trillions of dollars to be rich.
Everyone cannot be rich.
Good point there mate, I guess, it's just that the word "rich" for most us means that any people who have a lot of money and doesn't need to work because they really don't have to earn more money because they are rich. Well, that's the general idea most of us is getting from that word. What you said is really a good point and for me, there are all sorts of rich depending on how we justify the word rich. Anyone of us could be rich in different ways.