Chicago Fed: Slower Economic Growth In May
Jill Mislinski | Jun 26, 2017 09:12AM ET
"Index points to slower economic growth in May." This is the headline for today's release of the Chicago Fed's National Activity Index, and here is the opening paragraph from the report:
Led by declines in production-related indicators, the Chicago Fed National Activity Index (CFNAI) moved down to –0.26 in May from +0.57 in April. Three of the four broad categories of indicators that make up the index decreased from April, and three of the four categories made negative contributions to the index in May. The index’s three-month moving average, CFNAI-MA3, declined to +0.04 in May from +0.21 in April. [Link to News Release ]
The previous four months were revised upward.
Background on the CFNAI
The Chicago Fed's 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.
For a broad historical context, here is the complete CFNAI historical series dating from March 1967.
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.
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 2.68 to a low of -5.01 with an average monthly change of 0.62. That's 8% of the entire index range! The latest reading is a month-over-month change of 0.83.
Further underscoring the volatility is the roller-coaster list of CFNAI monthly headlines from 2015 forward.
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, we'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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