Economic improvement since 2010

Re-posted from mine of 24 October 2024:

Another look at US economic decline. I started with annual FRED data on Real GDP growth, inspected it, and added two trend lines -- one before the economic disaster of 2008-09 and one after:

The black line shows Real GDP, annual rate of growth. I omit the years before 1950, eliminating data from the Depression and World War Two.

The red trend line is based on the data for 1950-2000 and is displayed for the years 1950-2009.

The blue trend line is based on the data for 2010-2019 and is displayed for 2008-2023.

The 1950-2007 trend is visually indistinguishable from the 1950-2000 trend so I have excluded the years 2001-2007 from the trend calculation.

The 2010-2023 trend, excluding 2020 and 2021, is to my eye indistinguishable from the 2010-2019 trend as far back as the mid-1990s, so I have omitted the years after 2019 from the calculation.

The transition from down-trend to up-trend seems to occur during the Financial Crisis and Great Recession years, 2008-09.

The source data values are annual percentage rates. The trend lines are based on annual percentages. I read the trend values as percentage values.

The red trend runs from 4.326772247 (4.3%) in 1950 to 2.801315234 (2.8%) in 2009. The difference, spread over 59 increments, comes to a 0.026 percentage point trend loss per year or 0.26 per decade.

The blue trend runs from 2.02969697 (2.0%) in 2008 to 2.884242424 (2.9%) in 2023. The difference, spread over 15 increments, comes to a 0.057 percentage point trend gain per year or 0.57 per decade. The uptrend, so far, is rising twice as fast as the downtrend was falling. If it hadn't started from such a low level -- and if we didn't have the covid interruption -- the improvement would be obvious.

Assuming that the transition occurred in 2008-09, we can say that during the one year transition, trend growth fell by 0.7405 (0.74%) or, for comparison, just over 7.4% at the per-decade rate. That one-year trend-transition shock is equal to approximately 28.5 years of the 1950-2000 trend decline.