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March 17, 2011

Interpreting the Midwest Economy Index

by Scott Brave, senior business economist

On March 31, 2011, the Chicago Fed will begin releasing on a monthly basis an index designed to measure growth in nonfarm business activity in the Seventh Federal Reserve District states of Illinois, Indiana, Iowa, Michigan, and Wisconsin. This monthly index, called the Midwest Economy Index (MEI), will serve as a regional counterpart to the Chicago Fed’s National Activity Index (CFNAI), available here, and allow for a comparison of national and regional growth trends.

This blog serves as a source of background information on the MEI, detailing its construction and interpretation. In the future, this information will be available at www.chicagofed.org/mei. To receive email updates on the MEI as well as future releases, you can sign up at http://www.chicagofed.org/webpages/utilities/subscribe.cfm beginning March 31.

Background on the MEI

The MEI is a weighted average of 128 state and regional indicators encompassing the entirety of the five states in the Seventh Federal Reserve District. It measures growth in nonfarm business activity from four broad sectors of the Midwest economy: 1) manufacturing, 2) construction and mining, 3) services, and 4) consumer spending.

As with similar indexes of regional economic activity, the majority of the indicators in the MEI are based on data from the Payroll and Household Employment surveys and State Initial Unemployment Insurance claims.[1] However, for the manufacturing and construction and mining sectors, the MEI also captures production indicators, while for consumer spending it additionally includes data on personal income and home and retail sales.

The MEI incorporates indicators that are observed at both a monthly and quarterly frequency. To express the monthly index at a quarterly frequency, we translate all 128 indicators into a common frequency by taking a three-month moving average of the monthly indicators. In this sense, the MEI’s closest national counterpart is the three-month moving average of the CFNAI (the CFNAI-MA3). Every indicator is then given a stationary transformation and standardized to have a zero mean and unit variance.

The weight each indicator receives in the MEI depends upon the relative degree to which it explains the overall variation among all the indicators. In this fashion, greater influence in the index is given to those indicators that are able to best explain broader fluctuations in the Midwest economy. The degree to which this is true for any individual indicator is captured in the absolute value of its weight. A full list of indicators and their weights can be found here.

To be able to incorporate indicators that differ in originating date and reporting frequency, we follow the estimation strategy outlined by Stock and Watson.[2] This strategy is based on a statistical method called “principal component analysis” and is used to create a system of relative rankings, or weights, for the indicators. These weights are re-estimated each month, but in practice change very little given the substantial history of the index.

To illustrate the role played by each of the four sectors and five states, the pie charts below show what percentage of the variation in the 128 indicators explained by the MEI can be attributed to each sector (figure 1) or state (figure 2). Broad fluctuations in Midwest nonfarm business activity have historically been explained by the manufacturing sector and, to a lesser extent, the service sector, as well as by the three largest District states (Illinois, Michigan, and Wisconsin).

Interpreting the MEI

Our motivation in creating the MEI is to better understand the relationship between growth in national economic activity and growth in Midwest economic activity. The MEI is a measure of regional economic activity in much the same way as the CFNAI is a measure of national economic activity. CFNAI values above zero indicate growth in national economic activity above its historical trend, and values below zero indicate growth below trend. Similarly, MEI values correspond to deviations of growth in Midwest economic activity around its historical trend.

Over long periods, Midwest economic activity has tended to track national economic activity—as shown in figure 3, which compares the MEI and CFNAI-MA3. Both indexes in this figure have been expressed in standard deviation units, so that a value of –1 corresponds with growth that is 1 standard deviation below trend.

However, over shorter periods this has not always been the case, particularly around the beginnings and ends of recessions (the shaded regions in the figure as defined by the National Bureau of Economic Research, or NBER). To highlight such differences, we construct two separate index values: an absolute value and a relative value. The MEI (absolute value) captures both national and regional factors driving Midwest growth, while the relative MEI (relative value) provides a picture of Midwest growth conditions relative to those of the nation.

A positive value of the relative MEI indicates that regional growth is further above its trend than would typically be suggested based on the current deviation of national growth from its trend, while a negative value indicates the opposite. To obtain this interpretation for the relative MEI, we use the standardized residuals from linear regressions of each of the 128 indicators on the CFNAI-MA3 to construct the index.[3] This construction accounts for differences in national and regional growth trends and volatility that prohibit comparisons of magnitudes in the figure above.

Figure 4 shows the relative MEI in comparison to the CFNAI-MA3. The unit of measurement is again standard deviation units, so that a value of 1 for the relative MEI indicates that Midwest growth is 1 standard deviation greater than would typically be suggested given the level of the CFNAI-MA3. This figure shows that the Midwest business cycle was particularly pronounced during and after the recessions of the late 1970s, early 1980s, and 2007–09.

Other significant periods in which Midwest growth deviated substantially from national growth include the 2001 recession, which more adversely affected the Midwest region, and the 1990–91 recession, which was milder regionally but was preceded by a period of relative weakness.

Contributions to growth by sector and state

Additional information on the sources of growth in Midwest economic activity can be found by decomposing the MEI and relative MEI into contributions from the four broad sectors of the Midwest economy. The figure below plots the time series of these contributions over the history of the index.

Much of what we see in this figure can be summed up by the following: When manufacturing has thrived, so has the region. However, the contributions of the service sector to Midwest growth over time have become increasingly important. Consumer spending indicators show a similar pattern, making sizable contributions at business cycle peaks and troughs. Finally, the region has historically been less prone to large fluctuations in growth coming from the construction and mining sector than other parts of the nation.

Looking at regional versus national growth, the manufacturing and service sectors explain the vast majority of movements in the relative MEI. However, the contribution of services to the relative MEI is larger than it is to the MEI and nearly equal to that of manufacturing. This feature of the relative MEI reflects the importance of the service sector during periods where the Midwest economy has expanded or contracted faster than the nation. A good example of the former is the early to mid-1990s, while the early to mid-2000s exemplify the latter.

Using only the indicators for the respective states in the Seventh District, we construct state-level contributions to the MEI and relative MEI.[4] Figure 7 plots the time series of these contributions over the history of the index. No single state dominates growth in Midwest economic activity, although Illinois tends to make the largest contribution to both; and growth trends in nonfarm business activity across states are similar, with the exception of the weakness of the Michigan economy over the past decade.

During the recent recovery, all five Seventh District states have made positive contributions at one time or another to the MEI and relative MEI, suggesting that the manufacturing-driven recovery has benefited the region disproportionately. In the future, we invite you to track these developments through the charting utility for the Seventh Federal Reserve District found here.

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[1] See, for instance, Theodore M. Crone and Alan Clayton-Matthews, 2005, “Consistent economic indexes for the 50 states,” Review of Economics and Statistics, Vol. 87, No. 4, pp. 593–603. (Return to text)

[2]J. H. Stock and M. W. Watson, 2002, “Forecasting using principal components from a large number of predictors,” Journal of the American Statistical Association, Vol. 97, No. 460, pp. 1167–1179.(Return to text)

[3]Every indicator is regressed on the contemporaneous value of the CFNAI-MA3. Some indicators are also regressed on the lagged value of the CFNAI-MA3. These indicators are chosen based on the Bayesian Information Criterion, which balances the explanatory power gained by including an additional lag of the CFNAI-MA3 in the regression against the uncertainty introduced from the estimation of an additional parameter.(Return to text)

[4]A handful of indicators exist only at a regional level. To construct state contributions, we omit these variables. Therefore, the state contributions do not sum to the overall index in each period.(Return to text)


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March 14, 2011

Manufacturing in the Seventh District: Agriculture, Construction, and Mining Machinery

by Thomas Walstrum and Bill Testa

As discussed regularly in this blog, manufacturing has long played an important role in the Midwest economy. One of our most prominent manufacturing sectors is agriculture, construction, and mining machinery. This industry’s products are the large machines that plow fields and harvest crops, tear up and repave roads, dig mines and rescue miners. To define the sector specifically, we use the Census Bureau NAICS code 3331.

Two companies headquartered in the Midwest are such household names that you may have played with toy replicas of their products as a child--earth moving equipment maker Caterpillar and farm tractor and harvester maker John Deere. These two companies are the Midwest’s largest in the sector by market capitalization and revenue. As measured by company value, the agriculture, construction, and farm machinery industry has experienced a significant recovery since the financial crisis in 2008. Stock prices for all the sector’s companies based in the Midwest are near their 52-week highs and above their 2008 peak. From a low at the beginning of 2009, the S&P agriculture, construction and machinery index has dramatically outpaced the growth of the overall economy. In addition to the two heavy hitters mentioned earlier, the Midwest is home to a number of other companies, both public and privately owned, with a significant presence in this sector.

A couple of the publicly traded companies overlap with other sectors: Oshkosh also manufactures defense and fire & emergency equipment; Manitowoc also manufactures food service equipment.[1]

Like company stock prices, industry employment grew steadily until the financial crisis in 2008 and fell significantly in the aftermath. Employment began recovering in 2010, but is still 32,000 below the 2008 peak. Jobs are spread relatively evenly among the three subsectors. In December 2010, mining accounted for 35% of the sector’s total employment, construction 29%, and agriculture 36%.

According to the U.S. Department of Commerce, there are over 500 manufacturing establishments for the sector in the Illinois, Indiana, Iowa, Michigan and Indiana. The counties that are part of major metropolitan statistical areas or MSAs have notable concentrations of establishments, but the map below shows that manufacturing establishments are well distributed throughout the region. Some rural counties have a relatively large number of establishments, such as Sioux County in northwest Iowa and Houghton County in Michigan’s western Upper Peninsula.

The construction, mining, and agricultural machinery sector is an important part of all manufacturing in the Midwest. In terms of value-added by this sector to total manufacturing activity, in 2009 the sector contributed 1.6% to total U.S. manufacturing and 3.8% to Midwest manufacturing.

Within the sector, a significant proportion of manufacturing takes place in the Midwest. In 2009, almost one-third of all employees in the sector worked in the Midwest and just over 40% of the value added by the sector came from the Midwest. The sector’s footprint is largest in Illinois and Iowa, but Wisconsin makes a significant contribution as well.

In spite of its relatively small population, Iowa is the second largest producer of construction, mining, and agriculture machinery in the Midwest. For this reason, the industry is particularly important to Iowa in per capita terms. In 2009, more than 6 in 1,000 Iowans were employed by the sector--more than four times the regional average of 1.5 and ten times the national average of 0.6.

As reflected in recent trends, future prospects are bright for growth in the agriculture, construction, and mining machinery industry. Emerging economies such as China and India are continuing to experience significant economic growth, thereby lifting demand for machinery. With the growth of emerging economies, exports from the U.S. are becoming increasingly important. Beginning in 2004, exports for the U.S. industry increased by about 20% annually until the financial crisis of 2008. The parallel increase in the balance of trade provides further evidence that exports became an increasingly important part of industry growth between 2004 and 2008. While exports took a significant hit in 2009, they have recovered somewhat in 2010, and the trade balance is still well above levels in the early 2000s.

Producers of agriculture, construction, and mining machinery also serve a large U.S. market. Domestic sales in 2009 totaled nearly $60 billion; and domestic manufacturers hold a significant proportion of that market—73.6% in 2009.

Companies based in the Midwest have a presence outside North America to varying degrees. For companies that reported such figures in their annual reports, an average of 45% of revenue came from outside North America in 2010. Not all of that foreign revenue is from exports because production often takes place outside the US. For example, using data from Caterpillar's 2010 midyear report and fourth quarter 2010 earnings release, 45 % of their employment is U.S. based.

Among Midwest states, industry exports are most important to Illinois, representing 42.4% of sales, just below the U.S. average of 43.3%. For the Seventh District states, exports make up 31.0% of sales.
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[1] Aside from company financial data, the descriptive data to follow covers only the particular establishment sites that are primarily engaged in manufacturing products in the sector, whether the establishments are owned by public or private companies. (Return to text)


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