WTI Crude


Brent Crude


Natural Gas




Heating Oil


Rotate device for more commodity prices

Alt Text

Why The Huge Inventory Build Didn’t Crash Oil Prices

The 2nd biggest inventory build…

Alt Text

Europe’s Big Oil Breaks Even At $50-60 Per Barrel

According to credit agency Fitch,…

The Relationship Between Peak Oil and Peak Debt - Part 1

There is really a two-way link between peak oil and peak debt:

1. Peak oil tends to cause peak debt. Some will argue with me about this, because they believe it is possible to decouple economic growth from energy growth, and in particular oil growth. As far as I am concerned, though, this decoupling is simply an unproven hypothesis–the normal connection is that a flattening or decline in energy supply causes a slowdown or actual decline in economic growth, and this slowdown causes a shift from an increase in the amount of debt, to a decrease in the amount of debt, as it did for US non-governmental loans in 2009 and 2010 (Figure 1).

US Debt at Year end
Figure 1. US Domestic Debt, split between government debt (excluding Social Security) and non-governmental debt. Based on Federal Reserve Z.1 data.

Governments try to step in and keep the growth rate in debt up, but the gap is too great for them to make up. This tendency of governments to take on new debt (together with problems related to the original slowdown in economic growth) are reasons many governments have been getting into financial difficulty recently, in my view.

 2. Once debt growth peaks (shifts from growth to decline), we can expect a feed-back loop that will tend to make the peak oil decline even worse than it would otherwise be.
In the current post, called “Part 1?, I will cover the first of these two issues; I will cover the second issue in Part 2.

The Relationship Between Growth and Debt

I have talked many times about the need for economic growth, in order to make our current system of borrowing money, and paying back loans with interest, work on the extensive basis that it is used today.

Future Growth
Figure 2. Two views of future growth

As long as the economy is expanding, as in Scenario 1, businesses feel confident that their future prospects will be better than they are today. As a result, businesses will borrow funds for new equipment and will be fairly confident they can pay back the loans with interest in the future. Governments will also borrow, knowing that they will likely have higher tax collections in the future. Because of these higher tax collections, the governments can expect to pay back the debt plus the interest on the debt.

Even common citizens feel that debt is a reasonable prospect. If the individual loses his/her job, there is a good chance of getting a new one. With prospects for better wages  in the future (or at least no worse wages in the future), it makes sense to take out an automobile loan, or a student loan, or even a loan on a new home.

If the economy is expanding, promising Social Security benefits to future retirees looks like a safe prospect, as does promising Medicare benefits. Just as a “rising tide lifts all boats,” an expanding economic circle leaves room for more and more types of payments (Figure 3).

Growing Economy
Figure 3. A growing economy makes allows room for interest and other payments, without crimping budgets.

If the economy starts contracting as in Scenario 2 of Figure 2 (or even stays the same size) then it becomes much more difficult to repay debt with interest, and to fulfill promises of future benefits, as illustrated in Figure 4.

Economic Decline
Figure 4. Paying promises becomes much more difficult after economic decline.

Of course, in a contracting economy, there may still be a few instances where debt “makes sense.” These might include very short-term business loans, for example, covering goods in transit. They would also include some business loans where the economic return is high enough so the loan would make “economic sense” even if the interest rate includes a fairly high charge for risk of default (because of the declining economy) as part of the interest rate.

This decline in the level of debt becomes a real problem for countries, because the availability of debt tends to add to reported GDP. For example, if a person takes out a car loan and buys a car, the cost of the car gets added to GDP, even though the car is not yet paid for. The availability of debt financing also makes it possible for businesses to obtain capital for expansion, so the business can, for example, build more cars, without waiting for sufficient profits to accrue to have enough revenue to finance the expansion. Both of these activities tend make it easier to increase reported GDP.

What has happened in recent years, at least for the US, is that it seems to be taking greater and greater increases in debt to create a given increase in GDP.

change in debt to change in GDP
Figure 5. Relationship of change in debt (private and government combined) to change in GDP.

This changing relationship may reflect the greater headwinds the economy is encountering, now that oil supply is tighter and oil prices are higher.

Declining oil availability (manifested as high oil prices) tends to lead to economic contraction

Oil use, and energy use in general, tends to be tied to economic growth in many ways. Clearly there is a need for oil (or another energy product) to manufacture and transport goods, and to grow and transport food. Given the cars, trucks, trains, and farm equipment currently in use, it is not easy to change the dependence on oil quickly, either.

James Hamilton in his paper Historical Oil Shocks has shown that 10 out of 11 US recessions since World War II were preceded by oil price shocks. Charles Hall, Stephen Balogh, and David Murphy have shown that prices above $85 barrel in 2008 dollars a barrel tend to cause recession. Robert Ayres and Benjamin Warr have analyzed the amount of work (in a physics sense) that is done by energy of various types. Using this data, they have developed a model explaining the vast majority of US real economic growth between 1900 and 2000, except for a residual of about 12% after 1975.

Robert Hirsh has shown that there is a high correlation between world increases in world oil supply and increases in world GDP.

Relationship between world GDP growth and oil production growth.
Figure 6. Graphic by Robert Hirsch showing the relationship between world GDP growth and oil production growth.

In spite of all of this evidence, there are some who argue that it is not clear which direction the causation goes with respect to oil supply and economic growth–perhaps the only issue is that the world uses more oil when it is expanding, and less oil when it is contracting. With this belief, it is difficult to explain why oil price shocks would precede recessions, but some economists have learned this view in the past, and seem not to be open to looking at the evidence.

There is also a question as to whether we can move quickly away from this close between relationship oil and the economy, perhaps substituting another fuel source for oil. Vaclav Smil in Energy Transitions: History, Requirements and Prospects has shown that because of the very large amount of built infrastructure in place, in practice, energy transitions from one fuel to another take a very long time–30 in 50 years.

In spite of what Vaclav Smil has shown, it would seem as though there might still be some possibilities for short-term decoupling. For example, if car-pooling suddenly becomes much more common, it could tend to change this relationship. It is not clear that such a change would be fast enough, or significant enough, to change the basic relationship, however.

Recent Debt Problems of Governments

Recent debt problems of governments seem to be related to a combination of (1) the tendency of high oil prices to cause recession and (2) the additional debt the governments have tried to take on, to stimulate the economy and to bail out failing banks and other businesses. Part of this debt may be taken on, to try to offset the decline in private debt.
In the United States, federal external debt started increasing immediately after oil prices hit their peak in July 2008 (Figure 7).

Average quarterly oil price and US Federal External Debt
Figure 7. Average quarterly oil price and US Federal External Debt

Even with these huge increases in federal debt, the increase in governmental debt has not been able to offset the decline in debt held by businesses and private citizens, as shown in Figure 1 near the top of this post.

Governments around the world have been finding this additional debt burden increasingly difficult to handle. If nothing else, if interest cost of this debt becomes very burdensome, unless interest rates are very low. Furthermore, even when they do try to intervene, their debt doesn’t have quite the right effect–their new debt may buy a new road, but it doesn’t buy a new car for the consumer.

This combination of problems–recession caused by limited oil supply, and increasing need for government debt because of shrinking private debt and need to stimulate the economy seems to me to be what is behind the debt problems that so many governments (including the US government) are experiencing today. Many European countries are experiencing problems as well–Greece, Portugal, and Spain, for example.

In Part 2, we will look at some of the feedbacks of peak debt that may have an impact on the shape of the peak oil downslope.

By. Gail Tverberg

Gail Tverberg is a writer and speaker about energy issues. She is especially known for her work with financial issues associated with peak oil. Prior to getting involved with energy issues, Ms. Tverberg worked as an actuarial consultant. This work involved performing insurance-related analyses and forecasts. Her personal blog is ourfiniteworld.com. She is also an editor of The Oil Drum.

Back to homepage

Leave a comment
  • Anonymous on July 12 2011 said:
    The additional burden of high energy costs will hurt economies already breaking down under the twin curses of government debt and demographic decline. :cry: Not that the energy costs are the final coup, but every additional burden makes it more difficult for a society to innovate its way out of a quagmire.
  • Anonymous on July 13 2011 said:
    Groovy, Alfonso. But when the TV audience elects people like George W. Bush and Mr Obama, and in addition they nominate people like John and Sarah, then they are asking for trouble, sooner or later.We've have good presidents in the US, really good presidents, and with a little luck we can have another one...now that we absolutely need one.
  • Anonymous on July 14 2011 said:
    You know, in the classroom the relation between peak oil and peak debt is trivial. Just look at 2008. The bad news with the oil supply led to bad news with the aggregate energy supply which in turn led to lower productivities and put a strain on wages and salaries. But our friends wanted to maintain their consumption, which is natural, and so they borrowed and apparently borrowed to excess. Figuring out what that means is pretty simple, and the crunch comes when a lot of people are doing that. Better hope that...
  • Anonymous on July 23 2011 said:
    Gail,Reading your article has been a real pleasure! You have clearly, succinctly, and profoundly encapsulated the fundamental issue of our lives. This one issue alone is enough to control the rise (and fall) of civilization. Throw in a few other resource scarcity issues and the picture painted is indeed bleak. The best we can do is mitigate the situation. Which is why I want to know have there been any studies that have tried to correlate the level of debt in various (cities, states, and countries) and the extent and availability of public transport, food locally grown with organic methods? This area seems ripe for study if it has not been already. The beneficial changes seen in Cuba as presented in the film "The Power Of Community" (Or How Cuba Survived Peak Oil) and some of the points you made in this article make me think that the availability of efficient public transport and smart local food are also key issues that will control the fate of civilization. Thanks: Steve

Leave a comment

Oilprice - The No. 1 Source for Oil & Energy News