It's a fact that the majority of wealth increase has gone to the already wealthy over the last few decades. So while not literally true (clearly some money flows in other directions), it is broadly correct.
It's known as the "it's cheaper to be rich" paradox.
You save on buying in bulk and using better made products with longer lifespans, afford better education that makes you more difficult to fool and gets you a higher paying job, make more returns by investing more money, conserve willpower for important decisions by not having to choose between soap and bread at the store.