Are you sure that this chart shows bottom 25% of wages and not the bottom 25% of wage change?
They provide this definition: Wage Growth Tracker is a measure of the nominal wage growth of individuals. It is constructed using microdata from the Current Population Survey (CPS), and is the median percent change in the hourly wage of individuals observed 12 months apart.
Chart 1 plots the time series of the median, along with the mean, and the 75th and 25th percentiles of the individual wage growth distribution
I believe this chart will almost always show little or negative numbers for the bottom 25% of wage growth. By definition.
They provide this definition: Wage Growth Tracker is a measure of the nominal wage growth of individuals. It is constructed using microdata from the Current Population Survey (CPS), and is the median percent change in the hourly wage of individuals observed 12 months apart.
Chart 1 plots the time series of the median, along with the mean, and the 75th and 25th percentiles of the individual wage growth distribution
I believe this chart will almost always show little or negative numbers for the bottom 25% of wage growth. By definition.