Chicago Fed: Slower Economic Growth In October

"Index shows slower economic growth in October" : This is the headline for today's release of the Chicago Fed's National Activity Index.

The index went negative (meaning below-trend growth) after two positive (above-trend) months after being negative. It has been below trend for 13 of the past 20 months. Here are the opening paragraphs from the report:

Led by declines in employment- and production-related indicators, the Chicago Fed National Activity Index (CFNAI) decreased to –0.18 in October from +0.18 in September. Three of the four broad categories of indicators that make up the index decreased from September, and only one of the four categories made a positive contribution to the index in October.

The index's three-month moving average, CFNAI-MA3, increased to +0.06 in October from –0.02 in September, marking its first positive reading in eight months. October's CFNAI-MA3 suggests that growth in national economic activity was near its historical trend. The economic growth reflected in this level of the CFNAI-MA3 suggests limited inflationary pressure from economic activity over the coming year.

The CFNAI Diffusion Index increased to +0.21 in October from +0.07 in September. Forty-one of the 85 individual indicators made positive contributions to the CFNAI in October, while 44 made negative contributions. Forty-four indicators improved from September to October, while 40 indicators deteriorated and one was unchanged. Of the indicators that improved, 12 made negative contributions. [Download PDF News Release]

The Chicago Fed's National Activity Index (CFNAI) is a monthly indicator designed to gauge overall economic activity and related inflationary pressure. It is a composite of 85 monthly indicators as explained in this background PDF file on the Chicago Fed's website. The index is constructed so a zero value for the index indicates that the national economy is expanding at its historical trend rate of growth. Negative values indicate below-average growth, and positive values indicate above-average growth.

The first chart below shows the recent behavior of the index since 2007. The red dots show the indicator itself, which is quite noisy, together with the 3-month moving average (CFNAI-MA3), which is more useful as an indicator of the actual trend for coincident economic activity. I've added a high-low channel for the MA3 data since 2010. As we can see, the MA3 of the index is at the midpoint of this falling trend, but is has been rising since May.

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For a broad historical context, here is the complete CFNAI historical series dating from March 1967.

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The next chart highlights the -0.7 level. The Chicago Fed explains:

When the CFNAI-MA3 value moves below -0.70 following a period of economic expansion, there is an increasing likelihood that a recession has begun. Conversely, when the CFNAI-MA3 value moves above -0.70 following a period of economic contraction, there is an increasing likelihood that a recession has ended.

The next chart highlights the -0.70 level and the value of the CFNAI-MA3 at the start of the seven recession that during the timeframe of this indicator. The 1973-75 event was an outlier because of the rapid rise of inflation following the 1973 Oil Embargo. As for the other six, we see that all but one started when the CFNAI-MA3 was above the -0.70 level.

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The next chart includes an overlay of GDP, which reinforces the accuracy of the CFNAI as an indicator of coincident economic activity.

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Here's a chart of the CFNAI without the MA3 overlay — for the purpose of highlighting the high inter-month volatility. Consider: the index has ranged from a high 2.65 to a low of -4.93 with a average monthly change of 0.61. That's 8% of the entire index range! The latest reading is a month-over-month change is 0.36.

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Further underscoring the volatility is the roller-coaster list of CFNAI monthly headlines from 2011 forward.

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As the monthly chart depicts and the headline verbs reinforce, it's unwise to read very much into the data for any specific month. Also data revisions frequently make the real-time headline subsequently inaccurate. The 3-month moving average is a better number to watch.

The Long-Term Economic Trend

In the final chart I've let Excel draw a linear regression through the CFNAI data series. The slope confirms the casual impression of the previous charts that National Activity, as a function of the 85 indicators in the index, has been declining since its inception in the late 1960s, a trend that roughly coincides with the transition from a good-producing to a post-industrial service economy in the information age.

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For a more detailed perspective on long-term economic trends, see my latest Understanding the CFNAI Components, which I update and post a few hours after the CFNAI is released.

Source: Chicago Fed: Slower Economic Growth In October

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