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It seems to me that many people have gotten in the habit of following income trends by comparing classes over time. This is a deeply, deeply flawed method.
That right there should be enough to dismiss any claims of income trends using census data, but let's go deeper. In case you were wondering about household income:
It's the same problem with following household income by class! Of course, I like to point out the flaws that household income is unreliable because the composition of the household changes with time, divorces are at about 50% which makes this statistic even more unrealiable (unless this data is somehow corrected by excluding that, but anyway, this isn't my only criticism of following household data).
Now let's look at people who have gained more than 25% and those who have lost more than 25%.
All sourced here. https://www.cbo.gov/ftpdocs/95xx/doc9507/MainText.3.1.shtml#1088998
A substantial fraction of workers ages 25 to 55 (about 40 percent between 2002 and 2003) experience large changes in earnings from one year to the next (defined here as changes in earnings of 25 percent or more).
That right there should be enough to dismiss any claims of income trends using census data, but let's go deeper. In case you were wondering about household income:
Large changes in household income from year to year (defined here as changes in income of 25 percent or more) are less common than large changes in individual earnings. Still, about 25 percent of U.S. households experienced such large changes in income between 2004 and 2005.
It's the same problem with following household income by class! Of course, I like to point out the flaws that household income is unreliable because the composition of the household changes with time, divorces are at about 50% which makes this statistic even more unrealiable (unless this data is somehow corrected by excluding that, but anyway, this isn't my only criticism of following household data).
Now let's look at people who have gained more than 25% and those who have lost more than 25%.

All sourced here. https://www.cbo.gov/ftpdocs/95xx/doc9507/MainText.3.1.shtml#1088998
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