Visualizing GDP: An Inside Look At The Q3 Third Estimate

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By Doug Short

Note: The charts in this commentary have been updated to include the Q3 2016 Third Estimate released yesterday.

The chart below is a way to visualize real GDP change since 2007. It uses a stacked column chart to segment the four major components of GDP with a dashed line overlay to show the sum of the four, which is real GDP itself. Here is the latest overview from the Bureau of Labor Statistics:

The increase in real GDP in the third quarter primarily reflected positive contributions from PCE, exports, private inventory investment, nonresidential fixed investment, and federal government spending that were partly offset by negative contributions from residential fixed investment. Imports, which are a subtraction in the calculation of GDP, increased...

Let's take a closer look at the contributions of GDP of the four major subcomponents. The data source for this chart is the Excel file accompanying the BEA's latest GDP news release (see the links in the right column). Specifically, it uses Table 2: Contributions to Percent Change in Real Gross Domestic Product.

Note: The conventional practice is to round GDP to one decimal place, the latest at 3.5%. The GDP in the chart above is the real GDP calculated to two decimal places.

Over the time frame of this chart, the Personal Consumption Expenditures (PCE) component has shown the most consistent correlation with real GDP itself. When PCE has been positive, GDP has usually been positive, and vice versa. In the latest GDP data, the contribution of PCE came at 2.03 of the 3.52 real GDP, an upward revision from the Second Estimate, but a decline over the previous quarter resulting from substantial increases in the other three components.

The contribution from Gross Private Domestic Investment rose significantly from the previous quarter.

Net exports, which is largely impacted by fluctuations in dollar strength, made its largest contribution since Q4 of 2013. Government expenditures were fractionally positive.

Here is a look at the contribution changes between over the past four quarters. The difference between the two rightmost columns was addressed in BEA's GDP summary quoted above.

Here is a comparison of the three estimates of Q3 GDP, which enables us to see the direction of the revisions:

As for the role of Personal Consumption Expenditures (PCE) in GDP and how it has increased over time, here is a snapshot of the PCE-to-GDP ratio since the inception of quarterly GDP in 1947. To one decimal place, latest ratio of 69.2% is a slightly off its 69.3% record high in Q2. From a theoretical perspective, there is a point at which personal consumption as a percent of GDP can't really go any higher. We may be approaching that upper range.

Let's close with a look at the inverse behavior of three of the GPDI components during recessions. PCE and especially GC generally increase as a percent of GDP whereas GPDI declines. Note the three with different vertical axes (Personal Consumption Expenditures on the left, Gross Private Domestic Investment and Government Consumption on the right) to highlight the frequent inverse correlations.

The Advance Estimate for Q4 GDP will be published on January 27th.

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