Earlier quoted context omitted.
No. The world has absolutely gotten wealthier over the last few centuries. Wealth is obviously not zero sum. Humanity is far wealthier today than before the industrial revolution, and the trend is still towards increasing wealth.
As Led Zeppelin once said, "you know sometimes words have two meanings". That definition of wealth is all well and good for books about how markets are magical fix-everything pixie dust. But it's not the definition of wealth that applies when used to describe a person. A wealthy person is not someone with a lot of things. That's a hoarder. A wealthy person is someone who can use their economic power to shape the worl…
No, it actually means something. We have access to refrigeration, climate control, near-limitless computation, entertainment, transportation, knowledge, communication, and medicine. All of this stuff would BLOW THE MINDS of medieval kings. Even if you're living in a 1BR apartment, working at Walmart and struggling to pay rent, you enjoy many luxuries Charlemagne could scarcely dream of.
Go to the store, grab a pineapple off the shelf, take it home, and eat it. Then read about the great lengths [1] the wealthy people of the past went to in order to try to grow pineapples in Europe, and how obsessed the culture became with this fruit.