That “study” is a charity trying to guilt people into giving money. When you adjust for PPP it becomes quite a different story. The media loves it because it drives clicks but it’s literally just a calculator to guilt you and a list of approved charities.

This is what Oxfam has to say, from the actual article.

The immense concentration of wealth, driven significantly by increased monopolistic corporate power, has allowed large corporations and the ultrarich who exercise control over them to use their vast resources to shape global rules in their favor, often at the expense of everyone else.