It’s about “us” as in the global “us”. Not Canada. Not the USA. Even the poorest North American is in the top 20%. Being in this category means that magnitude changes are small. We’re on top already after all. How will the rest of the globe being better off make all of us better off? That’s the real story. NPR Planet Money provides a picture of what is happening with global incomes:
http://www.npr.org/blogs/money/2014/08/12/338347325/inequality-is-falling-on-planet-earth