Did We Need a Landmark Study to Tell Us Mobility Didn't Decrease for People Entering the Labor Market Between 1990 and 2007?

The Washington Post gave front page coverage to some serious non-news when it highlighted a "landmark" study showing no substantial changes in mobility for children born in the early 1990s relative to children born in the early 1970s. While this findings is presented as surprising to both people who expected an increase or decrease in mobility, it really would have been surprising if the study had found otherwise.

The big shift in the income distribution against workers at the bottom occurre...