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> more people are moving up a rung than falling down one.

How do you figure that? Do we have any data that backs that up?

You are commenting on the article that contains data that backs that up.

Since 1970. It's quite misleading to take two data points spread 55 years apart and make the titular claim as though the trend is continuing.

If you look at the top of this page you'll see an article with data.