North America During the Great Recession: Calculating the Severity Index in States, Provinces, and US Counties

 

Maximum GDP decline in Real GDP per capita during the Global Financial Crisis; for more detail, see Annex C1 below


This analysis is based on independent work I conducted over 2016 and 2017 and updated in June 2018, using the most recent data available at that time. (I thank Jim Haley for his helpful comments.) The views expressed here are entirely my own.  A PDF version is available here

I intend to update this piece in late 2022, when American, Canadian, and IMF GDP figures will be available for 2021.

Abstract

Carmen Reinhart and Kenneth Rogoff have developed a “Severity Index” to describe the effects of financial crises. For a given country, the Severity Index is the sum of the maximum percentage point decline in real GDP per capita and the number of years it takes real GDP per capita to return to its pre-crisis peak.

Extending Reinhart and Rogoff’s approach to the domestic level, the Severity Index can be calculated for individual US states, Canadian provinces, and US counties. Using data from the 2007-08 Global Financial Crisis, local Severity Indexes reveal sharp differences across North America. While some states and provinces experienced real GDP per capita declines below the national average, others vastly exceeded it. Indeed, some states and provinces have Severity Indexes on the same scale as Greece and Italy. Moreover, even as of 2017, numerous states, counties, and provinces still had not returned to their pre-crisis levels of RGDPPC. The worst-affected regions include the Southeastern and Southwestern United States, and Newfoundland and Labrador (by far the worst-affected Canadian province).

The wide variation in the effects of the crisis suggests that federal support should be carefully tailored to local circumstances. Blanket national approaches might be less effective, by failing to target the worst-off areas. 

Introduction and Definitions

In their 2009 book, This Time Is Different, Carmen Reinhart and Kenneth Rogoff analyze the effects of financial crises. They returned to the subject in a 2014 paper[1] and Reinhart addressed the topic again in an op-ed in early 2016.[2] In the former, they contend, “A significant part of the costs of [financial] crises lies in the protracted and halting nature of the recovery.”[3]

In this regard, Reinhart and Rogoff focus on changes in real GDP per capita (RGDPPC), arguing that it can be viewed as a proxy for productivity and that it is more reflective of the experience of individual citizens than real GDP growth. (For example, in a country with robust population growth, while RGDP is rising, RGDPPC might be falling.) Finally, RGDPPC data is widely available for many jurisdictions, including the IMF World Economic Outlook database and US and Canadian official data.

In their analysis, Reinhart and Rogoff cite three ways that RGDPPC changes during an economic slowdown, terming these “the three D’s”[4]:
  • The depth of the decline (the change in RGDPPC from the pre-recessionary maximum to the recessionary minimum, i.e., peak to trough)
  • The duration of the decline (the time it takes for RGDPPC to return to its pre-recessionary peak)
  • The number of dips (whether RGDPPC falls more than once before it returns to its pre-recessionary peak)
The first two “D’s” are used to compute the Severity Index (SI), which is defined as:
  • Depth (in basis points) + Duration (in years) = Severity Index
Though the number of dips does not factor in the calculation, more dips are usually associated with a higher Severity Index.

The calculation of the Severity Index can be illustrated with the early 1990s slowdown in the province of British Columbia:
  • Depth: RGDPPC fell 3.5% over 1989 to 1991
  • Duration: It returned to its 1989 level in 1999 (after 10 years)
  • Dips: It rose over 1991-93, but fell again in 1994-96 (double dip)
Hence, the Severity Index for this episode is 3.5% + 10 years = 13.5

Of note, British Columbia’s real GDP saw no decline during this period—hence, an indicator based on real GDP growth would miss this episode. 

Figure 1: RGDPPC in British Columbia, 1987-2000 


Source: Statistics Canada tables 36-10-0222-01 (real GDP) & 17-10-0005-01 (population)

International Applications of the Severity Index

Reinhart and Rogoff stress that the Severity Index is relevant only when a country undergoes a serious financial crisis. The example above (British Columbia in the 1980s) does not meet this definition. However, the concept can arguably be extended to any period in which RGDPPC declines, as a way of measuring the effects of any slowdown. This analysis will adopt this more liberal approach, calculating that the Severity Index at the local level in the United States and Canada.

Before turning to North America, a comparison with Europe is instructive. In her 2016 op-ed, Reinhart calculates the Severity Index for several countries in the wake of the 2007-08 Global Financial Crisis. The results are depressing, as they reveal that in many Euro Area countries—notably, Italy, Cyprus, and Greece—RGDPPC still has not returned to levels enjoyed before the Global Financial Crisis. Even in other countries that did not experience as sharp a decline in RGDPPC, the Severity Index can still be high, given the long duration of the recovery.

Annex A contains heat maps that show the maximum decline in RGDPPC as well as the Severity Index across Europe. Annex B contains a chart showing the historical decline in RGDPPC and a table computing the Severity Index for the Euro Area and the UK. These provide a point of reference for analysis of North American regions. 

The Severity Index in the United States 

States and Regions

The Bureau of Economic Analysis provides RGDPPC for every US state as well as eight regional groupings of states. Computing the Severity Index in the wake of the 2007-08 Global Financial Crisis. At the regional level, the recovery was uneven: the “Mideast” (Mid-Atlantic) region saw the smallest decline in RGDPPC and the quickest recovery, followed by the Great Plains. In contrast, by 2013, the US as a whole and five of its regions still had not recovered. As of 2016, the Rocky Mountain states had just barely returned to pre-crisis RGDPPC and the Southeast still had not recovered.

In general, these patterns persist at the state level, with Southeastern and Rocky Mountain states showing sharp declines. Some Northeastern states, such as Connecticut and Delaware, also show above-average declines. In contrast, the best performers include the Dakotas, Maryland, and West Virginia.

The worst performers include both urban (Rhode Island) and rural (Maine) states, manufacturing (Indiana) and agricultural (Mississippi) states, and are scattered across most of the country. This implies that the effects of the Global Financial Crisis were not concentrated in a particular region, or particularly severe for a certain type of economy. A possible explanation for this geographic dispersion is the different policy responses enacted by the various states in limiting the economic fallout. These were independent of geography, driven by pre-existing institutional structures, state resources, and local political preferences.

Please see Annex C for heat maps of US States (alongside Canadian Provinces and Territories) and Annex D for a chart showing the historical decline in RGDPPC across regions, as well as tables computing the Severity Index for regions and states. 

Counties

For a deeper level of granularity, it is possible to extend the Severity Index methodology to individual US counties; however, county-level data is only available for real personal income per capita (RPIPC) instead of RGDPPC. This is not a radical difference, as the fundamental concept remains the same: changes in RPIPC are a proxy for how individuals experience economic downturns.

In general, counties in the Rocky Mountains, Florida, and central United States experienced the largest declines in RPIPC. Examining the Severity Index reveals a patchwork of counties where RPIPC still has not returned to its pre-crisis peak. This is most concentrated in the extreme Southeast (including North Carolina, Florida and the Gulf Coast), southern Illinois, western North Dakota, the central Rockies, and the Southwest. Of note, several of the non-recovered areas (including in South Dakota, Utah, Arizona, and New Mexico) are home to large American Indian Reservations.[5]

This general pattern is consistent with that at the state level: the hardest-hit counties are scattered around the country, generally in rural areas.

Please see Annex E for heat maps of US counties, computed in terms of real personal income. 

The Severity Index in Canada’s Provinces & Territories

Using data from Statistics Canada, the Severity Index can be calculated for each of Canada’s provinces and territories. As in the United States, there were major differences across the country during the Global Financial Crisis. The provinces can be sorted into three groups: Severity Indexes are low in the east, higher in Ontario and British Columbia, and highest in the oil producing provinces.

On the East Coast, the Maritime provinces (Prince Edward Island [PEI], Nova Scotia, and New Brunswick), as well as Manitoba and Quebec, experienced only minor declines in RGDPPC (below 2.0%.) Most of these provinces also experienced rapid recoveries. Only New Brunswick experienced a prolonged period of RGDPPC stagnation, with a double dip recession. Of note, all these provinces are longstanding beneficiaries of Canada’s equalization program, and thus received transfers from the federal government throughout the downturn.[6]

Ontario and British Columbia, Canada’s first- and third-most populous provinces, have Severity Indexes that roughly match the national average (a not unexpected result, especially given Ontario’s population.) What is particularly striking is how closely Ontario’s experience mirrors that of the United States (with a decline of a similar scale and a matching recovery year), underscoring the province’s strong economic links south of the border.

The Global Financial Crisis had its most profound effects in Canada’s three oil-producing provinces: Alberta, Saskatchewan, and NL.[7] Declines in RGDPPC in these provinces exceeded the national average. Alberta’s decline began in 2006, first in the country, and Saskatchewan experienced a double dip decline starting in 2007. No sooner had the two western provinces returned to pre-crisis RGDPPC levels than the 2014 fall in oil prices caused new declines in RGDPPC. As of 2016, when the most recent RGDP data is available, Alberta was on track to experience an RGDPPC decline on a similar scale as during the Global Financial Crisis, and Saskatchewan a decline of a slightly smaller scale.

NL deserves special attention: between 2007 and 2009, RGDPPC fell 12.7%, the sharpest decline among the provinces. Alone among Canada’s provinces, NL’s RGDPPC still has not returned to its pre-crisis level. Though a partial recovery lasted until 2011, a second dip ended this in 2012. Falling oil prices provoked a third dip in 2014. NL’s decline is on the scale of Italy.

None of the three oil-producing provinces receives any federal transfers through equalization, and none are projected to receive any until 2020 at the earliest, if ever.

Data for Canada’s three territories shows a massive collapse in the Northwest Territories, similar to NL’s. Nunavut experienced declines in 2009 and 2013, and Yukon did in 2014. However, given the extremely low populations of the three territories, these results may be exaggerated. Small changes in the local economy, or shifts in population, can have a significant impact on territorial RGDPPC.

Please see Annex F for a chart showing the historical decline in RGDPPC across Canada’s Provinces and Territories, as well as tables computing the Severity Index for the Global Financial Crisis as well as the 2013/14 decline. Heat maps of Canada’s provinces and territories appear in Annex D. 

Conclusion

Reinhart and Rogoff’s Severity Index can be employed to analyze the effects of the Global Financial Crisis across North America. The wide variation in the effects of the crisis suggests that federal support (or state-level support, in the case of counties) should be carefully tailored by locality. Blanket national approaches may not be an effective response to economic crises, as resources will be directed to areas that do not need them: instead, relief should be targeted in areas with the highest priority.

There are limitations to this approach, notably the arbitrariness of most geographic boundaries. In large states and provinces, vastly different areas must be averaged together to compute state- or province-level RGDPPC. Though this is less of a problem at the county level, a different problem arises there: namely, lower populations may be associated with noisier data.

This paper suggests a potential area for further research, namely, whether declines in RGDPPC or RPIPC affect political preferences. Moreover, county-level RPIPC data could be compared with other indicators (such as unemployment levels, educational attainment, racial composition, health indicators, etc.) to map levels of economic and social strain in the United States.

Annex A: Heat Maps for Europe

A1: Heat Map for Europe: Maximum Depth of RGDPPC Decline, 2006-23*

Shading by Quartile





0.4% (Minimum)
4.5%
6.5%
10.0%
26.3% (Maximum)
Blue: Country where RGDPPC did not decline. 

Source: IMF World Economic Outlook Database, April 2018 edition. Map template adapted from Wikimedia Commons.
*Note: The IMF has projected RGDPPC to 23. 

A2: Heat Map for Europe: Severity Index, 2006-23*

Shading by Quartile





2.4 (Minimum)
9.6
12.5
17.6
33.8 (Maximum)
Blue: Country where RGDPPC did not decline and the Severity Index is therefore zero.
Black: Country not expected to return to pre-crisis RGDPPC before 2023*
Source: IMF World Economic Outlook Database, April 2018 edition. Map template adapted from Wikimedia Commons.
*Note: The IMF has projected RGDPPC to 2023.

Annex B: Data for the Euro Area & the UK

B1: Change in RGDPPC versus pre-crisis peak, 2006-16: Euro Area & UK


Source: IMF World Economic Outlook Database, April 2018 edition.

B2: Severity Index Calculation: Euro Area & UK


Dips
Depth
Duration
(Start)
Duration (End)
Severity Index
Austria
1
-4.0%
2008
2011
7.0
Belgium
2
-3.0%
2008
2015
10.0
Cyprus
1
-18.8%
2008
2023
33.8
Estonia
1
-18.9%
2007
2015
26.9
Finland
2
-8.7%
2008
2020
20.7
France
2
-3.8%
2007
2015
11.8
Germany
1
-5.2%
2008
2011
8.2
Greece
1
-26.3%
2007
Beyond 2023
> 42.3
Ireland
2
-10.5%
2007
2014
17.5
Italy
2
-11.9%
2007
Beyond 2023
> 27.9
Latvia
1
-17.4%
2007
2014
24.4
Lithuania
1
-13.9%
2008
2012
17.9
Luxembourg
2
-8.9%
2007
2018
19.9
Malta
1
-3.2%
2008
2011
6.2
Netherlands
2
-4.3%
2008
2016
12.3
Portugal
2
-7.0%
2008
2017
16.0
Slovakia
1
-5.5%
2008
2011
8.5
Slovenia
2
-11.7%
2008
2017
20.7
Spain
1
-10.6%
2007
2017
20.6
United Kingdom
1
-6.1%
2007
2015
14.1
Source: IMF World Economic Outlook Database, April 2018 edition.

Annex C: Heat Maps for States, Provinces & Territories

C1: Heat Map for States, Provinces & Territories: Maximum Depth of RGDPPC Decline, 2006-16

Shading by Quartile





0.1% (Minimum)
3.5%
5.5%
8.1%
25.2% (Maximum)

Sources: Source: Statistics Canada tables 36-10-0222-01 (real GDP) & 17-10-0005-01 (population), US Bureau of Economic Analysis, Regional Product Division. Map template adapted from Wikimedia Commons

C2: Heat Map for States, Provinces & Territories: Severity Index, 2006-16

Shading by Quartile





2.1 (Minimum)
5.2
9.6
12.7
25.5 (Maximum)
Black: area had not returned to pre-crisis RGDPPC as of 2016


Sources: Source: Statistics Canada tables 36-10-0222-01 (real GDP) & 17-10-0005-01 (population), US Bureau of Economic Analysis, Regional Product Division. Map template adapted from Wikimedia Commons.

Annex D: Data for US States & Regions 

D1: Change in RGDPPC versus pre-crisis peak, 2006-16: US Regions


Source: US Bureau of Economic Analysis, Regional Product Division

D2: Severity Index Calculation: US Regions


Dips
Depth
Duration
(Start)
Duration (End)
Severity Index
United States
1
-5.0%
2007
2014
12.0
New England
2
-3.9%
2007
2015
11.9
Mideast
1
-1.8%
2007
2010
4.8
Great Lakes
1
-7.3%
2007
2014
14.3
Plains
1
-3.0%
2008
2011
6.0
Southeast
2
-7.4%
2006
Beyond 2016
> 17.4
Southwest
1
-5.1%
2007
2012
10.1
Rocky Mountain
2
-5.6%
2007
2015
13.6
Far West
1
-5.8%
2007
2015
13.8
Source: US Bureau of Economic Analysis, Regional Product Division

D3: Severity Index Calculation: US States


Dips
Depth
Duration
(Start)
Duration (End)
Severity Index
Alabama
2
-6.3%
2006
Beyond 2016
> 16.3
Alaska
1
-3.7%
2009
2012
6.7
Arizona
2
-14.1%
2007
Beyond 2016
> 23.1
Arkansas
2
-5.5%
2006
2013
12.5
California
1
-6.2%
2007
2014
13.2
Colorado
1
-5.4%
2007
2014
12.4
Connecticut
1
-11.5%
2007
Beyond 2016
> 20.5
Delaware
3
-10.5%
2006
Beyond 2016
> 20.5
District of Columbia
2
-6.8%
2008
Beyond 2016
> 14.8
Florida
1
-14.1%
2006
Beyond 2016
> 24.1
Georgia
1
-11.7%
2005
Beyond 2016
> 22.7
Hawaii
2
-5.3%
2007
2016
14.3
Idaho
1
-8.0%
2007
Beyond 2016
> 17.0
Illinois
2
-5.7%
2007
2014
12.7
Indiana
1
-8.1%
2007
2014
15.1
Iowa
1
-4.9%
2007
2012
9.9
Kansas
2
-5.0%
2008
2014
11.0
Kentucky
1
-6.8%
2006
Beyond 2016
> 16.8
Louisiana
2
-11.1%
2006
Beyond 2016
> 21.1
Maine
2
-4.5%
2006
Beyond 2016
> 14.5
Maryland
1
-0.7%
2008
2010
2.7
Massachusetts
1
-2.9%
2007
2011
6.9
Michigan
1
-14.5%
2005
2016
25.5
Minnesota
1
-6.4%
2005
2014
15.4
Mississippi
3
-5.9%
2008
Beyond 2016
> 13.9
Missouri
2
-3.5%
2008
Beyond 2016
> 11.5
Montana
1
-3.7%
2007
2011
7.7
Nebraska
1
-1.4%
2011
2013
3.4
Nevada
1
-21.4%
2006
Beyond 2016
> 31.4
New Hampshire
1
-3.3%
2006
2013
10.3
New Jersey
2
-6.2%
2007
Beyond 2016
> 15.2
New Mexico
1
-3.8%
2008
2015
10.8
New York
1
-2.5%
2007
2010
5.5
North Carolina
3
-8.2%
2006
Beyond 2016
> 18.2
North Dakota
1
-0.6%
2012
2014
2.6
Ohio
1
-6.9%
2005
2012
13.9
Oklahoma
1
-4.4%
2008
2012
8.4
Oregon
1
-2.0%
2008
2010
4.0
Pennsylvania
1
-3.3%
2008
2011
6.3
Rhode Island
2
-6.2%
2006
Beyond 2016
> 16.2
South Carolina
2
-7.3%
2007
Beyond 2016
> 16.3
South Dakota
1
-0.1%
2008
2010
2.1
Tennessee
1
-7.3%
2006
2015
16.3
Texas
1
-3.9%
2007
2012
8.9
Utah
2
-8.4%
2007
Beyond 2016
> 17.4
Vermont
1
-2.2%
2008
2010
4.2
Virginia
2
-3.8%
2006
Beyond 2016
> 13.8
Washington
2
-5.6%
2007
2015
13.6
West Virginia
1
-0.3%
2008
2010
2.3
Wisconsin
1
-5.1%
2006
2013
12.1
Wyoming
1
-14.2%
2008
Beyond 2016
> 22.2
Source: US Bureau of Economic Analysis, Regional Product Division

Annex E: Heat Maps for US Counties

E1: Heat Map for US Counties: Maximum Depth of Real Personal Income Per Capita Decline, 2006-16

Shading by Quartile





0.0% (Minimum)
1.9%
3.8%
6.7%
63.8% (Maximum)
Blue: County where RPIPC did not decline.

Sources: US Bureau of Economic Analysis, Regional Income Division, US Federal Reserve Economic Data (implicit price deflator, annual, not seasonally adjusted / USAGDPDEFAISMEI.) Map template adapted from Wikimedia Commons.

E2: Heat Map for US Counties: Severity Index (based on Real Personal Income Per Capita), 2006-16

Shading by Quartile





1.0 (Minimum)  
4.4
7.3
11.8
71.8 (Maximum)
Blue: County where RPIPC did not decline.
Black: County that has not yet returned to pre-crisis RPIPC

Sources: US Bureau of Economic Analysis, Regional Income Division, US Federal Reserve Economic Data (implicit price deflator, annual, not seasonally adjusted / USAGDPDEFAISMEI.) Map template adapted from Wikimedia Commons.

Annex F: Data for Canadian Provinces & Territories 

F1: Change in RGDPPC versus pre-crisis peak, 2006-16: Canada


Source: Statistics Canada tables 36-10-0222-01 (real GDP) & 17-10-0005-01 (population)

F2: Severity Index Calculation: Canada, Global Financial Crisis


Dips
Depth
Duration
(Start)
Duration (End)
Severity Index
Canada
1
-4.1%
2007
2012
9.1
Newfoundland and Labrador
3
-12.7%
2007
Beyond 2016
> 21.7
Prince Edward Island
1
-0.5%
2008
2010
2.5
Nova Scotia
1
-1.1%
2011
2014
4.1
New Brunswick
2
-1.8%
2008
2015
8.8
Quebec
1
-1.9%
2008
2013
6.9
Ontario
1
-4.9%
2006
2014
12.9
Manitoba
1
-1.0%
2008
2010
3.0
Saskatchewan
2
-6.9%
2008
2013
11.9
Alberta
1
-9.2%
2006
2013
16.2
British Columbia
1
-4.4%
2007
2012
9.4
Yukon
0
0%
NA
NA
NA
Northwest Territories
2
-25.2%
2007
Beyond 2016
> 34.2
Nunavut
1
-9.0%
2008
2010
11.0
Source: Statistics Canada tables 36-10-0222-01 (real GDP) & 17-10-0005-01 (population)

F3: Severity Index Calculation: Canada, 2014 Oil Crash

These provinces and territories all experienced fresh declines in RGDPPC after 2013.

Dips
Depth
Duration
(Start)
Duration (End)
Severity Index
Newfoundland and Labrador*
1
-2.8%
2013
Beyond 2016
> 5.8
Prince Edward Island
1
-0.2%
2013
2015
2.2
Saskatchewan
1
-3.9%
2014
Beyond 2016
> 5.9
Alberta
1
-10.0%
2014
Beyond 2016
> 12.0
Yukon
1
-9.4%
2013
Beyond 2016
> 12.4
Nunavut
1
-5.1%
2013
Beyond 2016
> 8.1
*A fresh phase of its ongoing contraction starting in 2007 (see above.)
Source: Statistics Canada tables 36-10-0222-01 (real GDP) & 17-10-0005-01 (population)



[1] Carmen Reinhart and Kenneth Rogoff. “Recovery from Financial Crises: Evidence from 100 Episodes.” American Economic Review: Papers & Proceedings 2014, 104(5): 50–55
[2] Carmen Reinhart, “The Post-Crisis Economy’s Long Debt Hangover.” Project Syndicate, April 21, 2016.
[3] Reinhart and Rogoff, 2014, p. 50
[4] Reinhart and Rogoff, 2014, p. 51
[5] For a visual comparison, please consult the “American Indian Reservations Map,” based on census data.
[6] Federal transfers to Provinces and Territories are listed here.
[7] Alberta and Saskatchewan are home to Canada’s oil sands, while NL produces oil offshore in the Atlantic Ocean.