Ever more minor midsize players continued to see their share of America’s midsize sedan segment dwindle in September 2017. The cause: domination on the part of America’s two major midsize cars.

The all-new 2018 Toyota Camry enjoyed its first full month of meaningful availability in September and produced a 13-percent year-over-year U.S. sales improvement as a result. Meanwhile, Honda is clearing out remaining 2017 Accords in advance of the all-new 2018 Accord’s arrival this fall. Honda’s efforts produced a 10-percent uptick compared with September 2016.

Yet despite the big gains from the two major players, the upper class, the midsize segment still declined 7 percent in September because of sharp declines by many members of the middle class.

That means Camry and Accord market share continues to rise. That means the slice of the market earned by the middle class continues to shrink.