Aside from reading, just drive around town so he sees the good and the bad. The key is that there are more economic middle house houses than any other, plus the upper middle and on up.
Take him to a major shopping mall, as well as a Wal-Mart.
In any American city of any size, there's plenty of visible evidence of how well off the majority of the population really is.
And hunt up the URL of the Census.gov website. That will show the percentiles of incomes and all the other info available about demographics. Just as the website of the CDC and the DOJ give the lie to the anti-gun crowd.
Art
He lived in Canada for 5 years, in a city near Detroit, I'm not sure any sight seeing in Peoria, IL will challenge what he has seen of Detroit. I'm sure he knows very well, how well off Americans are. What the missing part is the hidden assumptions of why we are so well off.
I speculate that in his eyes, China has so many people with so few resources, which is why they are poor. Where in my eyes, I see so many people poor because of the taxation and burden and oppression by the gov't. In my eyes, the huge population is an awesome resource that in a free society would yield great prosperity for everyone in thier nation.
I think I might want to use the example of Estonia posted here awhile back, but I'll probably need to do some research before opening my mouth.
Drew