The second guesstimate by the Bureau of Economic Analysis (BEA) of Q3:2023 real Gross National PRODUCT’s annualized growth came in at 5.2%, up from the first guesstimate of 4.9%. Along with these data, the BEA reported its first guesstimate of annualized growth in real Gross Domestic INCOME (GDI) , 1.5%. In theory, both GDP and GDI should be the same. Both represent the value of goods and services produced in the economy. GDP calculates this value by adding up the value of expenditures in the economy – personal consumption, business expenditures, including the change in inventories, government expenditures and the change in net exports. Income is earned by some entities for the production of goods and services. So, GDI is the sum of wages, profits, interest income, rental income and taxes minus production/import subsidies.
As I mentioned above, in theory, real GDP and real GDI should be the same. But, in practice, they are not. Plotted in Chart 1 are the quarterly observations of the year-over-year percent changes in real GDI (blue line) and real GDP (red line) from 2010 through Q3:2023. Also plotted in Chart 1 are the quarterly observations of the percentage point differences between the year-over-year percent changes in real GDI and real GDP (the green bars). Notice that in the three quarters ended Q3:2023, these differences have widened out considerably, widened out to the negative side. The median difference from Q1:2010 through Q4:2022 has been 0.09 percentage points. That’s close enough for government work for saying real GDI and real GDP, as separately calculated, are the same. But in the four quarters ended Q3:2023, the median difference has been negative 1.97 percentage points. In Q3:2023 by itself, the difference between the year-over-year percent change in real GDI and real GDP was minus 3.16 percentage points, the widest absolute difference between changes in real GDI and real GDP in the period staring in Q1:2010 through Q3:2023. Granted, the real GDI data point for Q3:2023 is the BEA’s first guestimate of it.